Monitor turns off after startup on windows 7

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Hello,so here's the problem,I unplugged my computer and I put another computer(second 1 I have) in it's place,so when I wanted to use the first computer I plugged it again,plugged the monitor,everything is correctly plugged so there is not problem in that.I start the computer,everything is fine and than right before the log in part its goes black,I can hear my computer working and making that sound when it finishes the startup ,the monitor says "D-sub and than something,I don't know I don't think it's important,anyways I can go in the safe mode but I can't go in the normal mode,I had the same problem when I first got this laptop,but I can't remember what I did to fix this.Plz respond as soon as you can,Thank you.

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Hello,

Try this 1

When you switch ON your computer, start tapping the "F8" key to get "Startup

Settings" options ( if boot menu appears, press "Esc" key and keep tapping the

F8 key)

Select the option "Enable low-resolution video".

Good Luck
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Hello,
Try this 1
Let me know your monitor brand name and the model number.
Good Luck
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brand is LG and the only thing else I found is this GSM586D
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Hello,
Try this 1
Look at the back of your monitor to make sure that the given model number is correct.
Example LG E225
Let me know the resolution that you are trying to apply to it.
Good Luck
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HERE IT IS - LG FLATRON e2251vr-bn
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Hello,
Try this 1
1) Regarding your monitor "Screen Resolution"
Max D-SUB(Analog) :1920 x 1080 @ 60 Hz
DVI(Digital) / HDMI(Digital) :1920 x 1080 @ 60 Hz
Recommend VESA 1920 x 1080 @ 60 Hz
2) Click on Start --> In search bar, type devmgmt.msc and press Enter.
"Device Manager" will be opened. Expand "Monitors" by double-clicking on it . If it says "Plug & Play" then follow the below instructions.
Click on the hyperlink "Download" and follow the instructions
Download
Check you monitor model number in the given website and then scroll down the page and click on "Software Update".
Download the file "E2251_Driver.zip"
Extract the downloaded file.
Click on Start --> In search bar, type devmgmt.msc and press Enter.
"Device Manager" will be opened. Expand "Monitors" by double-clicking on it --> Now right-click on "Plug & Play" --> Select "Update Driver Software" --> Select the option "Browse my computer for driver software --> Click on the "Browse" button to select the extracted folder --> Click on OK and then on "Next" and then follow the onscreen instructions.
Good Luck