I picked up 2 used Mac Pro's today, the seller told me they were used in Graphics Development at an advertising company. Both are currently in non-working condition. The HDD and ram was pulled from both machines. They were however pretty cheap so I took a gamble as I really couldn't pass them up. I'll start off with some specs and then some questions: 1) Early 2008: Dual 2.8GHz Xeon Quad Core / 2x1G / 320 / 2600XT 2) Mid 2010: 2.8GHz Xeon Quad Core / 3x1G / 1TB / 5770 I did some reading before picking them up and they seem to mostely break down om memory issues, power supply or graphics card. As the ram was pulled and I don't have any ECC memory laying around, I'm not able to test much at the moment. I did however plug them in to see 'what they would still do', even without the memory. The Mid-2010 does absolutely nothing, which makes me believe it's most likely the power supply. (Although I am aware that the Logic board might also be the problem.) Hard drive 'bays' have been pulled out, which is a pity but nothing we can't handle. The Early-2008 however does power on. I don't see any immediate diagnostic leds on the mainboard and it does not 'beep' some error code for missing memory, but at least the power supply is still in working condition. I've also noticed that the 2 "boards" where the memory is supposed to go have also been pulled out. I've so far been unable to track those down through Google, could someone give me a clue as to what they're called? That might make things easier. (This one has 2 hard drive bays pulled out and 2 remaining, so I can borrow these for the 2010 if I manage to get it to work.) I've also noticed a lot of different Mac Pro power supply's are being sold. More specifically, the power supply's are 'destined' to go for the Early 2008 or 2009/2010 models. Are these really specific to the models or would I be able to put the 2008 power supply into the 2010 machine? At first sight they seem compatible, but I haven't done any true research about this yet. One final question, I've been looking for a teardown or service manual for both these machines but I haven't had much luck in actually finding it. Am I looking in all the wrong places or has Apple done a really good job of hiding it?