1 Reply Latest reply: Jan 21, 2012 8:33 AM by mnarigon
mnarigon Level 1 Level 1

I have a Mac Pro Mid 2010 8-core running 10.7.1. I routinely have to press the power button twice on startup. The first time I press it, I hear a click but no power up. Approximately 5  seconds later I hear a second click. After this second click I can press the power button and the system powers up normally.


I searched and saw that someone had pointed to not having a startup disk selected in the Startup Disk Preference as a possible cause. I do have a startup disk selected.


I have an ATI Radeon 5870 graphics card upgrade, but the card works correctly and I have re-verified that I have all the proper connections.


I have followed the instructions for the resetting the system management controller, but no change. Unfortunately, I do not know when having to press the power button twice started, so I can't trace to any particular system or software configuration change.


Thanks for any ideas.

Solved by mnarigon on Jan 21, 2012 8:33 AM Solved

In regards to this question, I took the computer in for service where they performed diagnostics and then replaced the power supply. The computer is now working fine.