Monitor gets no signal / Computer won't boot [Solved/Closed]

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Hey guys,

I've got a problem with my monitor/display and I hope it's not a sign of the mobo going bad. My computer all of a sudden decided to freeze up, and upon restart, the monitor won't get a signal, the light stays yellow.

All the other components appear to be running fine including all fans spin and the HDD. There's just no display going to the monitor.

I've tried two monitors on it and two different video cards. I've unplugged and rearranged the RAM, and still nothing is happening.

Also, for some reason, when it starts up, the DVD drive keeps acting like it wants to spin, and just keeps clicking away. I'm completely stumped, and hopefully this isn't a sign of the mobo going bad.

Any help would be great appreciated!

System Configuration: Windows XP
Internet Explorer 6.0
Intel Pentium 4
ASUS P5RD1-V Mobo
4 SATA HDDs
Powercolor ATI X800 vid card
See more 

20/32 replies

Best answer
4067
Thank you
Here could be one of the possible solutions:

Remove your power cord and hold the power button down for 30 seconds to a minute and then connect it back and turn it on!

Say "Thank you" 4067

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19thgreeny
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Thank you so much.. worked for me too.. I registered just to thank as well...
Why did this work, thanks but I'm so confused

<EDIT BY MODERATOR BECAUSE FOR SOME REASON I CAN"T ADD COMMENTS--This worked because the remaining power that was being stored, was keeping the "memory" locked up. By holding down the power button, in one fashion or another, this was a way to release all of the "Power" from the memory, and send it directly to the PC itself and try to boot. It is a way to understand why it works! Have FUN!
It worked perfectly the first time. You're amazing! Thanks!
wow i don't belive but it's works THX DUDE
Omg thank you so much! You are the man
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439
Thank you
You should start a new thread.

The first thing to rule out is overheating (CPU, motherboard, hard drive or power supply)
then I would check for bad memory (if you have two modules - swap them out for testing)
then I would test with another power supply
only after I have checked ALL of these would I think it was the Motherboard.

Good Luck
38
Thank you
Hey everyone,
I had a really similar problem that I have only just solved.
My PC is still really new only about 2 months old and its a pretty decent rig.
It crashed and totally froze up for ages so I unplugged it and turned it back on again and lo and behold, lol, no power to any peripherals or any monitor output.
Anyway after a few days without it I plucked up the courage to reset the CMOS with a screwdriver and it worked fine, I went into the BIOS like the manual instructed and 'restored optimal settings' and it rebooted with no results so I re-set it again and instead of going to the bios hit F1 for a normal boot and it is fine now UNTIL!
I turn it off =/
And then I need to reset it again so I don't really know how to solve this problem...
Anyone got any ideas?
Thanks a lot :)
hey all just had a the EXACT same problem as the original poster states. my comp crashed during normal operation and upon restart it loads bios then goes straight to ... monitor going to sleep. after a thurough checkout of all attached devices and hardware, I decided to start disassembly, with the motherboard fully exposed I examined all circuit components. as a prior nuclear missile mechanic with us air force electronic principles training, I can sort of read a circuit card, while I cant claim to be able to decipher what the electricity is doing on its many paths and busses without a schematic... I can visually identify a bad circuit component if it is visibly detectable, the only anomoly I noted was that all my capacitors located around my cpu were bloated and there was a minute amount of orange residue on the tops of each one, 8 total, which screams bad capacitors to me and essentially makes sense, due that the bios are loaded through the cmos battery and not your standard 120vac -> power supply -> circut components -> cpu, so I ordered 10 6.3v 2200 microfarad discharge capacitors and de-soldered the blown ones, and am currently awaiting my new ones. once they arrive and I solder them in ill let you know if the problem is solved. total cost $5.95, the capacitors in question are electrolytic capacitors and look like little aluminum beer cans or batteries. so in the meantime examine your motherboaeds and check your capacitors, if they look the way I described they are most likely blown.
> Atchzien -
capacitors successfully soldered in, computer built back up, and system back to normal functioning order! that was all it took! so I urge you to check your capacitors read on the side of it to see voltage and capacitance measured in microfarads, order replacements off various onlie vendor, I used rubycon mbz's and have actually noticed a silight increase in processing speed, as opposed to my blown 5 year old nichicon hm(m)'s. steps to
de-soldering and soldering. are listed below.

step one: remove motherboard

WARNING
soldering iron is very hot, use controlled movements
try your best to not slip off of target area and scorch current
pathways and innocent components and ic chips.


step two: heating from the backside of the printed circuit card apply the tip of the iron to the tip of the the first soldered in pin applying medium pressure while grasping capacitor from front side with a pair of pliers gently work the pin free; repeat for corresponding pins and capacitors untill all damaged capacitors are removed.

step three: apply soldering iron tip to solder filled hole to melt solder

step four: insert a small stiff piece of aluminum of copper wire to clear a hole, work in and out letting solder cool until a suitable hole is formed to facilitate installation of replacement capacitor mounting pins.

step five: install replacement capacitors with striped side facing the white side of mounting site on printed circuit card

step six: apply heat to pin base, then touch solder to tip of soldering iron transfering from the soldering iron to base of pin.

step seven: trim excess wire

step eight: reassemble computer
30
Thank you
I just experienced the same problem with my HP Pavilion desktop this morning, I hadn't used it for a while because I was moving,and last time I used it, it worked fine, but when I plugged it in this morning, power came on, hdd spun, dvd had power, all fans spinning, but no monitor signal or boot up or beeps. It seemed as though the PC wasn't getting enough power to boot.
I thought something might have been knocked loose when it was moved, so I unplugged the hdd cables, video card and power cables to the motherboard quite a few times, checked the ram, though I didn't remove the ram, and took out the battery and then back in again, and I checked for dust but everything seems very clean. After a longwhile of fiddling around with all the connections, Eventually it just started fine for no good reason and went into windows, but then when I tried to restart it it just kept losing power and rebooting at the windows load up, turned it off and it wouldn't boot and no display again, all the time there were no beeps or funny noises. So I pulled one of the ram sticks out completely, started it and away it went, perfect, I tried turning it on an off a few times, and it continued to work well. So then I put the ram back in, and it reads both and it is currently still working fine, even after restarting a number of times. ??!
I can't be 100% sure, but it seems that the ram may have not been contacting properly, although it felt secure and was clipped in properly, others with this problem could try doing the same, and I did use an anti-static strap. It might be that the ram stick was not seated to the motherboard correctly. I thought it was odd as I thought it should have sent a beep code indicating the ram was at fault, but I think that my onboard speaker is not connected, also strange is it went fine with one of the two ram sticks removed, and then after putting it back in they both were reading and I tried turning in on and off again a few times and it seems to be working fine now.
However, I still have a a nagging thought that something other than the ram could have caused it, I am thinking if if one ram wasn't seated properly, it still should have booted up on the other one, as it did when I removed it. If it does the same thing again, I would then assume that the ram or the ram slot on the mb is bad, or the PSU is faulty and not providing enough power. And at the worst, the CPU is faulty or even worse than that the is the motherboard is at fault.
My best guess for now is that the ram was causing an error, and conflicting with the other ram, preventing the PC from booting, after removing it and then reseating it in the same place it removed the error or compatibility issue.
Update: Ok, now my PC starts every time, but last night it crashed while I was playing a game, the screen said no display briefly then the screen just went black and all's I could see is a blinking white line, I turned off the PC and on again, the PC started fine, I ran PC doctor, testing the ram, motherboard, and CPU, everything passed, then the computer crashed again, but this time it just froze, and I couldn't reboot, so I turned it off and went to bed. Today it booted into windows fine, started PCdoctor and after I scanned the hard drive, I left it idle for a few minutes and the screen went black, no blicking line or nothing, but it did not try to reboot, it just crashed. I then restarted windows and ran PC doctor again, stress tested CPU, HDD, video adapter, video card, and memory, no faults again, didn't crash, the hard drive needs defrag, so that has been running for an hour or so now, and it hasn't crashed yet. I also made sure all the power saving settings were off, which they were. Seems to be some intermittant fault somewhere. I can't go online with it though, it just crashes when you go online, I use the laptop for that. The ram chips are the same type, but not the same brand, when I do the memory scan, it gives me all the information about one ram chip, but nothing about the other except it's capacity, I have two 512MB sticks. I'll try updating the bios and a few other things, then if nothing changes I will get some flux cleaner and try cleaning the contacts of the memory slots and sticks, then if that doesn't work, buy new ram, and try that on it's own, I might also try getting a new PSU too, I have read somewhere that the power supply can also cause faults like this if it's underpowered or faulty.
> esssss -
UPDATE 2 (RESOLVED?): Well been playing on the PC for many hours now over the past few days, and it hasn't had problems since. The hdd was very fragged, so removed some software like anti-virus and a few games and large files, then ran a clean-up and lastly a defrag of the master hdd (seagate 200 GB SATA)..... it was pretty fragged, it took around four hours to sort out, but seems to be going a bit faster now, most importantly no freezes or crashes so far. :D
24
Thank you
I had the same problem recently where there was no signal to the monitor but everything seemed to be running. I purchased a new video card and was not the problem. I tried the other tricks mentioned here like pulling the power cord and holding the start button, swapping ram but no luck. I finally pulled the battery from the BIOS and viola, it started. Question is; does that mean the battery is getting weak and needs to be changed? I guess if the problem persists I'll try that.

Thanks for the posts.
21
Thank you
I tried kareem's suggestion unplugged power cord and held down power button for 1 minute and there was a signal again! Thanks so much! I tried holding down power button for 30 seconds but that didn't work.
20
Thank you
I have the same problem with my Dell computer "computer all of a sudden decided to freeze up, and upon restart, the monitor won't get a signal, the light stays yellow". And I will try Kareem's way to see if it is working. Thanks !
20
Thank you
Yea, well my computer has something of the same issue. my dad was tinkering with it, and when I tried turning it on after the moniter just said no signal'. Im not sure if this helps, but my mouse light doesnt show, nor does my keyboard light, even thought they are both plugged in. ive tried 2 different moniters and 2 different mouses. Im not sure and im really stuck.
xpcman
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It looks like the power supply is dead if you have no lights.
18
Thank you
today morning when I woke up and turned on my PC ( AMD 3500+ w NVidia 6800GSold sturdy for the last 3 yrs)
the monitor didnt get turned on because of no signal.
i restarted and heard no RAM beep.
took the RAM out of the MOBO turned on again.. heard the beeps - signal that MOBO isnt smoked. so luckily checked this forum on my iPhone.
last nite I had kicked the CPU accidentally and the mouse came loose. So I hastily put it back in the keyboard socket. ( I use USB keyboard so the KeyBoard socket was empty)

Today after the problem. I tried the Pressing power button without the power cord trick but it didnt work
then I remembered that only the KB and mouse have to be plugged in so I removed the USB KB and put the normal one in and found out the mistake with the MOuse socket
so I put them both where they should be and VOILA it worked. im typing from my PC now :) THANKS OP
15
Thank you
To All,

I experienced same problem months ago. Yes I did the Power Cord thing and some times it worked for me. Also I used safe mode to be able to get video and this I did type by memory since I was not able to see at the time I was booting. What finally solved my situation for ever was to go back to the original driver of the video card (ATI HD4870) by installing it from the safe mode in Windows Vista. Month later I got a later version of the driver, even newer than the first updgrade I had for it. Never had problems back. Also I was always suspicious about Windows update since some times after doing a system recovery the problem was not happening for a while but this is pure speculation.

By the way the future is LINUX. Keep that in mind, that day all of these problems will go away.
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15
Thank you
Thank you so much. You literally just made my life. I love you.
14
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hi guys. I had the same prob wid my intel p4 3.7ghz 1gig ram. I tried everyting and was on the verge of givin up. my pc fired up everyting workn but no signal on da monitor and my hdd led stayed on al the time. I thought my mobo was bad. reset da cmos tried different ram, hdd nothing at al. al I did - I changed da jumpers on my hdd n cd-roms. I added da primary master hdd along wid a slave cd rom. n my secondary master cd rom wid a slave hdd.
> esssss -
I cannot tell you the solution 100% and dunno if you've fixed or, (lol) trashed the machine as i've not looked at this thread for some time, but I can tell you I have had some very quirky problems with ram in the past, if it is a recent problem refer to the latest thing you did to your machine, if you did nothing, it is either a hardware failure or software failure, things to keep in mind, some motherboards just plain dont like some ram manufacturers and are incompatible, some ram sticks are made as a set of two and must be used together (I.E 2 512mb "ram kit" = 1gb ram "kit") the best way to troubleshoot is to trade ram with a friend for a few days or buy a couple new sticks if the problem persists your ram sticks are most likely fine, then move to next higher assembly, your motherboard, it could be as simple as a bad socket visually inspect for corrsion, scorch marks, bent pins, and foreign objects but note that a microscopic short can cause fatal errors to your computer so you may not be able to see the problem.
If you can find nothing wrong in the hardware sector, then try a low-level format utility to wipe your machine and then re-install the bios per http://www.ehow.com/how_4843572_reinstall-bios.html these instructions require you to use a usb flash drive, before you do this though if you can get your hands on another hard drive remove yours and replace with the extra and wait for the problem to happen again, if it doesnt, then go ahead with the reformat.
but given the information in your post, I suspect an incompatibility with your ramsticks with each other, or one of them doesnt get along with your motherboard. good luck.
> esssss -
I cannot tell you the solution 100% and dunno if you've fixed or, (lol) trashed the machine as i've not looked at this thread for some time, but I can tell you I have had some very quirky problems with ram in the past, if it is a recent problem refer to the latest thing you did to your machine, if you did nothing, it is either a hardware failure or software failure, things to keep in mind, some motherboards just plain dont like some ram manufacturers and are incompatible, some ram sticks are made as a set of two and must be used together (I.E 2 512mb "ram kit" = 1gb ram "kit") the best way to troubleshoot is to trade ram with a friend for a few days or buy a couple new sticks if the problem persists your ram sticks are most likely fine, then move to next higher assembly, your motherboard, it could be as simple as a bad socket visually inspect for corrsion, scorch marks, bent pins, and foreign objects but note that a microscopic short can cause fatal errors to your computer so you may not be able to see the problem.
If you can find nothing wrong in the hardware sector, then try a low-level format utility to wipe your machine and then re-install the bios per http://www.ehow.com/how_4843572_reinstall-bios.html these instructions require you to use a usb flash drive, before you do this though if you can get your hands on another hard drive remove yours and replace with the extra and wait for the problem to happen again, if it doesnt, then go ahead with the reformat.
but given the information in your post, I suspect an incompatibility with your ramsticks with each other, or one of them doesnt get along with your motherboard. good luck.
Good day Mr. Atchzien,
I'd experience problem on no monitor signal/laptop wont boot normally as it is.I'm not sure what really happens but these were the things that I'd observed and done with my laptop.First I heard of 1 long and 2 short beeps and booting problem starts.My laptop is HP Dv6000, these are my cases hope you can advice me of what to do:
1.when I on the power it will give 1L+2S beeps and no display that proceeds to
A.booting windows sound (w/out display)
B.just going to heat up with fan moving slow to fast and cannot proceed on monitor display

2.sometimes after power on a light (blue) will stuck on micro/memory card slot along with the USBs and after seconds (maybe 20 0r 30s) it attempt restart and after same seconds restart again and again.

3.I followed other advices on the blogs like heating them up for 10 to 15 minutes then make it rest for 1 minute it will start if not then heat it up again or same procedure til I can make it start and have the display.

One time I did open my laptop, clean it from dust and observed CMOS battery with some white like powder sticking to its body and clean it up.Also observed that when system is on it will read its hardwares one by one I guess as it is programmed but it is like not reading its graphics or video card if I'm not wrong that's why it is beeping 1L+2S beeps and when its heat with following restarts(manually) it reads the graphics/video card and then ON.when its not normally ON its worrisome and that's my problem hoping you can help me troubleshoot this matter.I had been to service center and they told me to change motherboard which is so expensive like you want to buy new one (since warranty is over).Please I need your advice or opinion or perhaps guide to make this back to normal.Thank you.
hi whats the problem of my computer? that when I open it the display on the screen is no signal, then the monitor goes blank. pls help me.
theirs no signal on my minitor
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13
Thank you
I suspect that you have set the screen resolution to a value not supported by your monitor. When in safe mode the resolution is set to a safe universal value that works on all monitors. First check your monitor manual for the maximum resolution and refresh rate. Then use safe mode and change your settings to those values.

Good Luck
13
Thank you
Had the same problem. Online and all of a sudden the monitor goes black and tells me to check the video cable. Checked cables, all connections, unplugged and reset using the power button NOTHING. Switched out the video card and WHAM problem solved. However my victory was short lived. I changed the video card last night and this morning same thing happened, all of a sudden black screen. I had one more video card which is what I'm using right now. But if the problem is with the mother board then its going to short out this card too. So if anyone knows anything as to what might be causing this please help. I checked all the previous responses and looked for all of the signs of a busted mother board but it looks all good. Any other suggestions?
10
Thank you
Hi man im getting desperate I have the exact same problem and I have tried resetting bios with the battery thing ,removing the ram, unplugging the unnecesary stuf ,taking the cpu owt and taking the gfx card owt and to no avail it still wont work...... when I power up all fans spin but the gfx card soes something weird.. the fan keeps reving up and then dow and up and down BUT when I removed the ram to test that other theory the gfx card's fan kept at a normal speed constantly, everything seems to work but still a black screen I have a brand new lcd that says "check siginal cable" but everything is plugd in when I removed the hdd and started no beep, removed the ram no beep this is the second time this year this has hapend and the pc is only 7 months old the first time I sent it in to the place where I bought it and they said the mobo pci-e slot is faulty and the gave me a brand new mobo now today a month later the problem is back with a vengence and I am really fed up plz any help or hints would be grately appreciated

specs:
PROC-AMD 6000+~3.1Ghz
MOBO-ASUS M2N68
RAM-2X 1GB INFINITY DDRII
PSU-COOLERMASTER 550W
GFX- nVidia MSI 9800GTX+ PLUS OC
HDD-SEAGATE 160GB
Since the monitor says check signal cable, that leads me to assume that you need to try a different cable to connect the monitor to your graphics card. Even though the monitor is new (and we can assume the cable is too) you can't assume that the cable doesn't have a short in it.
6
Thank you
Thanks for all the information here... finally after all the trouble shoooting to my desktop, finally have found out what's the problem. My video card is already not working no wonder it has no display and no signal.
5
Thank you
Alot of people have answered this question with alot of good answers to, however, one situation has yet to be cowered, the one I was just in, I had installed everything into a new case and lo and behold, black screen, nothing happend, tried replacing everything, still nothing, then out of curiosity I decided to setup my pc outside of the case, on a filt map just to see what would happen, the computer booted instantly without a glitch. Point to this is, when you install a pc, make sure everything is installed correctly and that there is nothing that can cause a short circuit or otherwise interfeer with the motherboard, if the motherboard is not installed correctly, it wont boot, might be a small thing as 1 mm of metal touching in the wrong spot. So, if its a new build, take everything out, install 1 item at a time carefully and make sure its positioned correctly, if you do that, it will boot unless u have some unfortunate HW defect.
5
Thank you
Had almost the same problem. I had to force the shut down holding the power button. Then the comp didnt even boot, just did that high pitched beep continuously. Tried to unplug hard disk/keyboard/mouse/monitor, but still wont boot and made those beeps. So then I removed the RAM, booted, turned it off, replaced the RAM, booted and it was all working fine. Looks like it had something to do with the ram (memory cache flushed?). Anyway, it works fine now.
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Thank you
ello,

My spare PC has also come down to this blank boot screen nonsense after a freak freeze that required a reboot, I've stripped the PC down and cleaned all parts and tried the erazer trick on the gold strips on ram and gpu card to no avail. At this time all the devices appear to power up, the fans all spin up and stay on, mobo LED is green, video card led powered, and soft reset and hard power buttons respond as normal. All I get is constant "No signal" message on both monitors I've tried, and no post or signs of it booting. In addition there no error beeps without ram in, it only beeps when GPU is unpowered. So whats the most likely solution? new PSU ?

Specs:

DDR1 pc3200 (4x1024mb)
P4 Prescott 3ghz
Zalaman Flower CPU cooler (Regreased when cleaned)
Asus P4c800 Deluxe mobo
Asus 6800 AGPx8
500W PSU
SATA1 HD
DVDRW IDE

Unfortunately I no longer have spare components for this to test with.
> Kareem -
hi man im getting desperate I have the exact same problem and I have tried resetting bios with the battery thing ,removing the ram, unplugging the unnecesary stuf ,taking the cpu owt and taking the gfx card owt and to no avail it still wont work...... when I power up all fans spin but the gfx card soes something weird.. the fan keeps reving up and then dow and up and down BUT when I removed the ram to test that other theory the gfx card's fan kept at a normal speed constantly, everything seems to work but still a black screen I have a brand new lcd that says "check siginal cable" but everything is plugd in when I removed the hdd and started no beep, removed the ram no beep this is the second time this year this has hapend and the pc is only 7 months old the first time I sent it in to the place where I bought it and they said the mobo pci-e slot is faulty and the gave me a brand new mobo now today a month later the problem is back with a vengence and I am really fed up plz any help or hints would be grately appreciated

specs:
PROC-AMD 6000+~3.1Ghz
MOBO-ASUS M2N68
RAM-2X 1GB INFINITY DDRII
PSU-COOLERMASTER 550W
GFX- nVidia MSI 9800GTX+ PLUS OC
HDD-SEAGATE 160GB
warnockdavid
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> Kareem -
email: Email id removed for security

I tried your solution and it worked like magic. It put me into the CMOS. After exiting the CMOS it's doing the same thing and the unplug/on button solution won't work.

ANY OTHER IDEAS?

tHANKS,
dAVID
> Kareem -
Hi Kareem

I tried what you mentioned, but it still does not work

Do you have any other solutions that I could try out?


(I have the same problem - everything inside the computer is running, but no response/signal to the monitor).

Any help would be greatly appreciated.

Thanks in advance
> Kareem -
ive tried the unplugged thing it works but then when I change the HD it has no signal again ive tried the 30 seconds to 1 min and it dosent work again please help thanks you the best
Dear Mr. Highway72

Power on computer & press F8 to start computer with safe mode. Go to display settings and change screen resolution to minimum. Now restart computer you are done!!!
3
Thank you
i have the same problem as Guayaco36, most of the time it happens when rebooting and its very anoying:(
specs: gigabyte GA-MA790X-UD4, Phenom II X3 720 BE, 4gb kingston khx8500
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