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Wake it up. No, seriously. What you see is most likely the video signal not getting from the video card to the monitor. When that happens, the monitor takes a nap. Problem could be a loose cable, sleep setting on the computer, or bad video card. Check each of these in the order I listed, as they are easy to hard.
There is a slim chance that the monitor indeed has a problem. Rule out the other possible issues before jumping to that conclusion. If you ultimately believe it to be the monitor, try to borrow someone else's monitor to see how that one reacts.
Check the cord and connections for the monitor; this has one wire that must have voltage on it or the monitor goes to sleep, and a broken wire or loose connection will fool it into thinking you are powering down. If this doesn't work try going into power options and setting monitor to never power down.
try another cable I have tis problem on mine & I have to do them up solid, also check for bent pins in the cable & bend the back carefully & unplugged.If not you may need to set up the computer to output, try another monitor to rule that out.
Hope this helps!
Check your video card is seated correctly in the computer.
Disconnect the power and video cable first.
Open the side panel, lift the card up and push it back into the slot with a gentle side to side wiggle as you go.
Also if possible try another video card.
Another thing is to check is if your computer has onboard video. It will be a blue socket on the motherboard at the rear panel where your USB ports etc are.