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Member Since 13 Jul 2005
Offline Last Active Jul 10 2013 09:05 PM

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Mac Pro 2006 CPU B fail

23 December 2010 - 06:45 AM

I bought an as-is original 2006 Mac Pro that I'm trying to get working. Unfortunately, I know nothing about its history. As found it was complete except for the RAM, video card, hard drive, and side cover. I bought a pair of 1GB Samsung 667MHz FB DDR2 DIMMs, and flashed a Radion HD3870 with Mac firmware.

It turns on, but there is no turn on chime, and the sleep LED remains on, then after about 5 seconds, the CPU B fail LED turns on. I have tired swapping the CPUs, and running it with only one CPU in both the A and B sockets with no change. The sleep LED blinks if I turn it on with no RAM, so at least it can detect a RAM error. It doesn't appear to detect the keyboard and mouse, so I can't reset the pram, but I did remove the battery. I also tried it without the video card in case my flashed 3870 is causing problems, but there's still no chime. I even tried the firmware recovery procedure, but the sleep light just blinks rapidly when I hold the power button and it never opens the DVD dive.

Everything is pointing to a bad logic board, but before I call it dead, is there anything else I'm missing? Does the Mac pro logic board have any known weaknesses or common failures?
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