Chosen Solution
Hey guys. I have a late 2017 iMac Pro that recently just completely stopped working without warning. Worked fine one night, then the next morning it wouldn’t turn on. I tried different power outlets, I purchased a new power cord, and nothing changed. Then I took it apart. There are four points where the power supply makes contact with the logic board and I noticed one of those connections wasn’t touching. I remedied that, cleared out any dust, put everything back together, but still nothing. Can anyone tell me if/how I can test my PSU to see if it’s bad, or what else I might be able to do?
Well, there are a few things you should be able to check to see if the logic board is getting power. Using a DVM are you able measure the voltages across the two screws on each side of the power supply? Is the logic board onboard diagnostic LED’s lit at all?
FYI: I had the same exact thing happen to my iMac Pro on the 8th of May. It just stopped working. No power. No hum. Nadda. Ziltch. Took it in to the Apple Store and they fixed it with a “hard software reset” which, it seems, included the EFI firmware and OS. Oddly, the cost was $0. Sounded odd to me. A firmware update gone bad?
