Older 20-inch Cinema Display powering on and off repeatedly

I recently inherited an older (clear) 20-inch Cinema Display that I'm trying to use with my G5 dual 2.3 running 10.4.8. After purchasing the expensive DVI to ADC adapter and hooking it up, everything worked fine for about maybe 20 minutes or so until the display started to cycle on and off every two or three seconds (off for a couple seconds, then on for a couple seconds, repeat endlessly). This is accompanied by the power button glowing on and then off so it seems as if the power is cycling on and off by itself.
Any ideas? At first I suspected the ADC/DVI adapter which got really hot when in use, but letting it cool down had no effect on the monitor's behavior. My clunky old 19" CRT display works with no problems, so it's not the video card. The Cinema Display is my old monitor from work, and never had any performance issues, although it's been in storage for almost a year.
PowerMac G5 Dual 2.3 GHz   Mac OS X (10.4.8)  

Same thing is happening to me. I have the 20" Cinema Display (clear with ADC).
Last night I was in another room and all of a sudden I heard my G4 (Digital Audio) restart. I thought I was hearing things. Then about 3 minutes later I heard it again. I thought my daughter was up working on the computer or something. So I went up and there was no one around, but the computer kept restarting every 1 or two minutes. It was very strange – sometimes it it would go to sleep in the middle of the boot process.
I was able to stop this process eventually by disabling the display power button in the Energy Saver and Displays prefs panels. But I would like this feature to be functional since it makes my setup easier to use for my kids.

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