Help - white screen only!

Friends,
I'm faceing a totally annoying problem - the G4 worked fine until an hour ago, when I moved it to another room... Now at start the monitor only goes WHITE and... that's it. No restarts, no resets (PRAM, etc.) can help!!! I hear the starting chime, the fan works, etc, so I figure the tower works, but smth. is wrong with the display connection.
The Apple supprot page only comments "black screen"... and indicated problems with the video card... Mine works... or worked OK..
Any suggestions?
Thanks!

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