Posted 05 October 2008 - 10:42 AM
Welcome to bleepingcomputer!
I would try resetting the cmos. If you have the manual, or if you look it up online, it can tell you the way to set the jumpers to do this. You can also just simply take the large watch battery out of the computer for a couple minutes (unplug the computer from the wall first, of course), and afterward, put it back in and try turning the computer back on.
If this doesn't help, I would suspect a failing power supply. Just yesterday I went to a ladies house to fix her computer. I tried a power supply I pulled from a dead system in her computer because her's wouldn't turn on at all. I hadn't tried that power supply so I didn't know if it worked or not. Anyway, it would turn the computer on, but would not give a display on the monitor. So I went home and got a power supply I knew worked, and of course the computer booted up fine, display and all.
Before you go out and buy one though, I would see if you could pull one from another computer just to see if it really is the problem. No display could also be caused by many other things such as a bad motherboard, or bad ram.
"I think there is a world market for maybe five computers." - Thomas Watson, Chairman of IBM, 1943