Well, I recently acquired a PowerMac G4 (FW 800), and a Formac 17" ADC display for my brother. At my apartment, everything seemed fine. It was booted up at my place for maybe 2 hours without a hitch. I brought it down to his place yesterday, set everything up, and started it up. Everything was fine for about 3.5-4 hours, and then the computer just shut off. After some fiddling, I discovered then unplugging the display allowed the computer to power up, but when I plugged the display back into the computer it immediately shut down. When the display is plugged into the computer you can hear a faint clicking coming from the PSU.
This leads me to believe that because the display is drawing power from the computer instead of the mains that it is causing a drain on the power supply. I guess my question is why is this happening, and why was it working flawlessly for hours before this happened? I don't currently have another ADC display to test, nor will I will be able to get over there with a DVI display (the computer has no VGA port) anytime soon. I've considered ordering the Apple DVI to ADC adapter to get the display independantly powered, but I would appreciate some advice before I throw another hundred bucks on an aging machine. Thanks!