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You should check the "Power Options" when the computer "Sleeps" & "Hibernates". Go to the "Control Panel" if you Win 7 or below, if you have Win 10 just type "Power" on the "Search Box" on the bottom left of the screen and then click "Edit a Power Plan" and set when the Computer "Sleeps" and when it "Hibernates". Basically when you move your mouse you are waking up the Computer from "Sleeping" or "Hibernating". Goodluck.
The problem can be bad power supply due to bad caps, bad backlights inverter, or bad lamps. You need to open it up tell us what you see inside first, see example of faile monitors due to bad caps: http://s807.photobucket.com/home/budm/allalbums
Have you tried hooking up an external moniter? If so do you have video on that moniter? If you do have video on the external moniter then you most likely have a bad inverter or a bad lcd panel.I would replace the inverter first because it's not very expensive.If that doesn't work then you can replace the lcd panelAnd if that doesn't work you have problems at the system board level.
screen goes dark
I tried the moniter in a different pc with the same result.
i think there might be problem in monitor adjustment.
2 if it is ok then the problem in video section.
3 also check for loose connector
4 crt base might be loose.