One of our users computers on the network has a ~2009 Intel Mac Pro. On Friday the machine was fine, shut down correctly at the end of the day as normal.
This morning (Monday) the Mac Pro will not power up. After pressing the power button we get 1-2 seconds where the "on" LED is lit, then it goes off. We have removed all components, and blown with canned air, reseated everything, reset the SMC, but still the same issue.
The Mac Pro has 2 DIMM "boards", one of which is full (4 slots) and the other which has 2 slots free. On the brief power-up, all 4 LED's are lit on both DIMM boards, they're not on long enough to do anything else, is this normal? We've reseated all the RAM and the boards, but no change. We've even removed components such as the graphics card, and sticks of RAM individually but no change.
I've read that if the system detects no RAM it will beep 3 times, we removed all the RAM but no beep, I think because the system is not powered up long enough.
Any suggestions? We think it's a PSU but can't be sure.