G4 display went black. Please help.

My screen will not wake up. Once I move the mouse, the screen will show for about a second and then it goes back to black. The display light is on and the computer seems to be working. I've tried shutting it down, vacumming the port, pressing f2 to change the contrast. I've also tried (with the quick second I can see the screen) to go to system preferences and then display to see if I need to change the brightness but I don't have enough time to see anything to get there. I run a small business out of my apartment so every second this is down it's hard on me. Any help greatly appreciated.

I have the same issue (on, then fade to black (actually dark reverse video) in 2 seconds) - I used to be able to fix it by shutting & reopening the display; now when it happens, I need to twist the display (please don't break your display trying this) - I grab the top-left & top-right corners of the open display, twist the left back, and the right forward. I twist back & forth until the display light up and stays lit when I let go. Once working, I leave the display open, using the power button to sleep instead of closing the display. Once the cat nudges the display and it goes dark, I repeat.
If you can't get it going and you need the screen working fast, press Crtl-Alt-Command-8 to activate reverse video, and increase the display brightness.

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G4 display went black. Please help.

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