Black screen

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Hello, I have a problem, when i turn on my pc all i see is a black screen with no signal written on it, the pc is running and its on, i can hear the sound and the lights but the black screen is still there, i tried unplugging and plugging back in, i switches between HDMI cable and VGA, nothing wont help, i did it on a monitor and 2 different TV's. I don't know whats wrong, i never opened the PC or tried fixing it so i need your help people.. :( what do i do?



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Did you hear any beeps?

Apart from cable faulty there is a culprit for no signal in monitor that is with RAM.

Did you know how to remove and replace it again in the slot?
If dont know ask me i will explain.
>
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first i had it plugged in to the monitor, and then i tried unplugging, still no sound.

usually on my other pc it would make a sound if i didn't have any ram inside but now it just turns the pc on for 5 seconds and turns it automatically of and then again on and off like in a circle motion.
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I thought your power supply unit is faulty. Did you have any other power supply unit?
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my power supply unit is working just fine, but the tv/monitor wont show the video
if i have RAM inside the PC, the PC could be powered on for a long time, but there would still be black screen with no signal..
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Did you have any external graphic card?
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You say it just turns the pc on for 5 seconds and turns it automatically of and then again on and off like in a circle motion.
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i have an external graphic card yeah.
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Ok then, Did your card working good before, or it is new one?
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i bought the PC last month, i didnt change anything on it.
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connect everything switch on the pc, press F8 immediately the startup of your pc, enter into safe mode.
If unable to do anything, tell me your graphic card model and power supply rating.
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nothing happens when i press f8...

Nvidia GeForce GTX 960.
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The card mentioned need atleast 400w power to run good!
Did you have atleast 500 watts power supply unit?
Try to remove the card (if you know then do it otherwise don't)
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i got a 400 wats power supply .
ill just take the computer to someone so he can fix it, i've got no idea how to do it..
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Ok if you need help then post here.
Regards