Help! Mac Pro 5,1 Power Issues

[mohnumber7]

I had the exactly same behavior. The solution: replaced the PSU. Most likely the capacitors start failing. I even started checking them with an ESR meter and a multimiter, but there are so many of them, that I gave up. All that I managed to check were within their specs.

did you have same issues when you replaced a new psu?

 

[startergo]

did you have same issues when you replaced a new psu?

No

 

[Lord Blackadder]

what did you do finally? what's the problem finally? i've the same.

Sadly, no, I have retired that machine. I ran out of patience fighting a losing battle against Apple's planned obsolescence - even if I fix the PSU issue, I still need a Metal GPU and then will have to go through the hassle of the patched firmware / OS updates to get this thing useable. Doable, but nope, I've had enough.

If you have the same issue, your only course of action is to replace the PSU. But beware - there are no NOS replacements I am aware of, and you simply have to trust that the 'refurbished' units for sale at numerous vendors are in decent shape and will last. If I had more time and money I'd go that route, but I have too many other projects in hand and this one is low priority anymore.

Funnily enough, my heavily upgraded PowerMac G4 'Digital Audio' is still in perfect working order, complete with a suite of early 2000s games and non-subscription Adobe Creative Suite. Ah, those were the days.

 

[mohnumber7]

Sadly, no, I have retired that machine. I ran out of patience fighting a losing battle against Apple's planned obsolescence - even if I fix the PSU issue, I still need a Metal GPU and then will have to go through the hassle of the patched firmware / OS updates to get this thing useable. Doable, but nope, I've had enough.

If you have the same issue, your only course of action is to replace the PSU. But beware - there are no NOS replacements I am aware of, and you simply have to trust that the 'refurbished' units for sale at numerous vendors are in decent shape and will last. If I had more time and money I'd go that route, but I have too many other projects in hand and this one is low priority anymore.

Funnily enough, my heavily upgraded PowerMac G4 'Digital Audio' is still in perfect working order, complete with a suite of early 2000s games and non-subscription Adobe Creative Suite. Ah, those were the days.

I understand, thanks for your answer