05-26-2017, 05:03 PM
ka jowct wrote:
I was suspicious that it could be a power supply issue. I remember similar behavior many moons ago with my MDD. It was the "quiet" replacement power supply that failed, so I had to do that swap twice. I didn't enjoy wrestling that thing into place once, let alone twice. I ended up putting the original one back in. The quieter fan stayed in there, so it wasn't as loud as it had been originally, even with the original power supply back in it.
At that time, it was almost the same $$ to just buy another MDD than to buy a power supply.
I have tracked a few power supplies for the Mac Pro on eBay. How nasty is the replacement procedure? Used power supplies are much cheaper, of course, but I always wonder whether the sellers have properly tested them.
BTW I am running from my freshly restored main boot drive that I cloned from a backup in the wee hours last night. Luckily, I had a clone from the night before. That leaves only one of the hosed internal drives still to deal with, which is not too bad.
The power supply is actually fairly easy to replace.
https://www.ifixit.com/Guide/Mac+Pro+Fir...ment/32222