Studio Display: power but no video??

I have a Studio Display monitor connected to Quicksilver G4 via the ADC cable. The monitor is getting power but there's no video. I don't have access to another ADC-equipped computer for testing. Any ideas as to where the problem might lie?

Check to make sure your video card is firmly in place in the AGP or PCI slot. If l not firmly in place it can cause a black screen on boot. Also, is the backlight on the monitor lighting up when you start the monitor? Try holding a flashlight or other bright light up to the monitor to see if you can see anything, if you can see something then its working, but A) the backlight is turned down, or B) the backlight is dead.

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