In a moment of weakness, I picked up a 2.0 GHz Dual G5. The price was good and I knew from the outset that it didn't boot. It chimes, the drive spools up, but no video appears. If you sit long enough the CPU fans accelerate to warp 9. Judging from Google this is a pretty common problem - but short on solutions. Some suggestions of failed logic boards and/or CPUs OR power supplies. I've got a known good logic board coming, and don't want to brick it. I'm checking to see if anyone thinks the G5's got a failure mode that would damage the donor logic board. I'd rather replace one part a time until it boots.