|No display at all--not even the posting or logo screen? Then everything is NOT working. You hear the fans and drives spin up and probably see LEDs flashing so you think you have some video problem. Those symptoms aren't uncommon with a power supply or motherboard failure. But, just in case, have you tried the monitor on another computer or another monitor with that one?|
Do you hear any beeps? Did anything happen to it or did you make any changes between the last time it worked OK and the first time it didn't?