Chosen Solution
My Mac Pro will no longer power up. It seems completely dead and will not even show the power led when trying to power up. I’ve tried a Reset holding the power for 5 secs to reset the PMU but no joy. Any help appreciated
Power Supply dead! Replaced and happy bunny again|!
According to which MacPro you have, there is probably a 3.6 volt AA Lithium battery. It looks like this: http://www.frys.com/product/2977135 I would replace that first. This is most likely a power supply issue and not a logic board issue. Here is a discussion on your problem: http://www.blograndom.com/blog/2007/11/c… Do not replace the power supply unless you have the original system installation disks as they contain a program for syncing the fans. If the sync is not done the fans will run wild. If you can let us know about the battery and any symptoms at all it would help. There are specific tests for the lead out on the power supply and how much voltage each lead should have. If you want or need to go that far let me know.
Try a different power cord try a different battery. If neither work suspect logic board. If one works suspect the other power connector (DC in or Battery) If this answer is acceptable please return and mark it. Good Luck, N.
Mayer i have a similar problem, i have the mac pro 1,1 quad 2.66. it kept crashing and then today it just died, no lights come on the logic board when i plug in the power cord, not even after u pressed the SMC reset or the one above. would that be all connected to a fried power supply or should try the battery??
