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The setup menu on your monitor needs to be changed. On most monitors there are buttons which you press in sequence, go through these buttons and you will find a monitor mode which allows it to stay on permanently.
I was called to repair similar incident last week. A Compaq box (don't remember the model) with a 'smart' usb keyboard. By this I mean that the keyboard had a row of what I'll call hot buttons. The client had pushed a button with a moon on it causing the monitor to go into sleep mode. I suspect that whatever key you pushed had the same effect.
After plugging a known good monitor into the faulty box I verified that the box was OK. This left me to think the monitor itself had a problem. Plugged the suspect monitor into a known good machine.. and it worked fine!!!
Set machine and monitor to original configuration and still had no video. Decided that the monitor was too smart for its own good and maybe there was something in the monitors menu. Pushed and held the 'menu' button on the monitor for a few seconds and menu comes forward. Green power led also comes on (surprising me) so I powered up the computer and lo and behold the problem is fixed!
Either 1.) The resolution/frequency your computer is currently running at is a higher resolution then the monitor can handle. Use a different monitor, if it works then lower resolution and replace with the vusys.
2.) You have physical failure. Your video card, cable, or monitor is bad. (Or you don't have it plugged into the right card). Try a different monitor if it works then and you did step one, then you probably have a bad cable or monitor.
You got two outlooks, a fried motherboard or a fried component. If you have integrated graphics then its probably your motherboard, if you have your own, separate graphics card installed then it could have to do with your graphics card.
Google is your friend. It might not be damaged hardware, just some bug.