So I just picked up a free OG dual 2GHz G5 today and have been working on it most of the day. I have come across an issue though. Whenever I load an app or anything, the system revs the fans like crazy then they settle back down. Having had this issue before, I repasted the CPUs and went to run the Thermal Calibration test from ASD 2.5.8. Everything is fine until about 15 mins in when it crashes. And I don’t mean it locks up; The computer completely hard powers off. It comes right back on and I do not have this issue while booted into Mac OS X but what could be causing this crash? It also has not made a bit of difference as the fans continue to rev. I’m thinking it may have a problem writing the new thermal calibration into NVRAM or wherever it’s stored.