Hi My father's early 2008 Mac Pro recently had a hard stop. Shut down dead, and now won't come back on. All signs point to a faulty PSU. I followed the hint in this thread http://forums.macrumors.com/showthread.php?t=1082046 on testing the unused power block in the optical bay, and it didn't register anything. I've pulled the PSU out, and before I go ahead and try and find a replacement, I wanted to test it. Problem is the 4 blocks of black cables look nothing like a "normal" 24 pin ATX connector... So, can anyone point me in the right direction on how to test this with a multimeter? If it helps, I found this: http://aquamac.proboards.com/thread/1032 which has a description of the blocks. I'm just not sure if I need to jump any of them. Thanks!