Mac Pro 3.1 Booting Problem

[snaper]

Hi Guys,

I just signed in, because I have a big trouble with my machine, and it seems, no professionals could help me.

Around a month ago, my machine started act weirdly : shutting down, instead of go to sleep mode.
A few days later, it did not want to start, so I sent it a service centre. They sad, a few days later, no problem with the machine at all, and sent it back to me.

Actually, there was really no problem with it for around a week, then, again, won't start.

This morning, I've plugged it off the wall, and left.
After I've got home from the work, tried it, and now, it works.

I've checked the diagnostic LEDs during a failed boot, and everything seems normal, then **** down, then the OTA and OTB LEDs lights up for a second and thats all.

I think it is a PS problem, but before I'm gonna sped 200 EUR for a new PSU, I would like to be sure...

Have any of you every experienced the same?

 

[strukt]

Intermittent problems can be difficult to troubleshoot.

I would maybe remove all RAM sticks except one, and run the computer for a while to see if the behaviour changes.

If that doesn't work. Reinstall the system without transferring the backup. See if a clean system helps.

Remove some hard drives if you have more of them.

Remove extra PCI cards.

Etc..

Good luck.

 

[snaper]

Hi Strukt,

Did everything you mentioned. Tried to start without RAM, GPU, HDDs, nothing.
SMC reset, no luck...
After 8-10 hours unplugged, its OK now, but now, I'm afraid to turn it off

Still suspicious about the PSU :S
[doublepost=1467318720][/doublepost]Oh, forgot to mention, that there is no startup chime since it came back from the service centre...