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You might have put the computer into hibernate; have you tried pressing the power button? It should wake the computer up if it is asleep or hibernating. It is also possible that your monitor cable is unplugged.
For windows 7 you have to change the power settings and stop it from hibernating.Go to control panel. Go to System And Security. Go to power options / Change when the computer sleeps and change that setting to never. It gets locked in a perpetual loop when it hibernates and locks up..
In windows click start, control panel, power options. On the first page"when the computer is plugged in" turn monitor off NEVER on the hibernate tab uncheck enable hibernation if checked, also disable sleep mode
Have you gone into the BIOS to make sure there aren't any power managment features? Do you get the same thing happening if plugged into a different wall socket? Sometimes bad power surges can cause this problem. Other issues have been known to arise from motherboard problems. Or NIC power settings...strangely enough...a quick way to test if it's NIC related might be too unplug any cables from the NIC to see if it stays on or not? There are power settings on NICs in advanced settings. Let me know if any of that helps and remember to rate the solutions. Thanks!
I think this is more of a problem on your computer instead of the monitor, ofcourse you could try another monitor and see if the same happens. I suspect your computer goes into standby or hibernation on its own, and it does work fine if you reset the computer right?
if you go into power management again, disable or turn off hibernation completely, its on one of the pages.
Make sure its not set to standby, and also disable your screen saver.
Right click on desktop - properties - then screensaver. turn it to none.
Also you could look into the computer bios and make sure its not set to standby or hibernation from there. thats unlikely but you could check.
how to get into bios.. depends on the computer, right when you turn it on, on one of the corners of the screen you will get a message, press button to enter setup or bios. press that to enter bios when its presented.