Hello folks, My Mac Pro 3,1 2008 (2x 3.2 quad core) died, there is no sign of life, no lights, no sound... dead! Everything was fine a day before before I switched off and went to bed. Next day when I pushed the power button nothing happened. I tried few more times with no success. Next I've checked the AC cord and it did work on my Mac Pro 1,1, so the AC cord was Ok. To summarise: 1. SMC reset didn't work 2. Removed everything (HDD, Graphics, ram, memory riser....) and again, no success. 3. I checked the diagnostic LEDs, and none of them light up when I press the diagnose button, with power and without power. I am trying to figure out if the PSU or the motherboard died. I was wondering if anyone has had a similar issue and how it was sorted. Any ideas or tips are most welcome. Thanks in advance.