[SOLVED] Random restarts - loud noise - have to unplug to be able to start again.

[EvilHamster]

Hi all.

I bought a used Hp Prodesk 600 G1. This is the timeline of the events:

• I bent a few pins on the motherboard (CPU socket).
• PC would not turn on.
• I straightened the Pins and pressed the CMOS button (jumper?).
• PC turned on, though the initial HP screen comes up twice.
• I installed Linux.
• All worked nice the whole day (2-3 hours).
• Next morning the PC was on, (even though, I think, it was switched off at night!).
• Shortly after, if made a loud noise (all fans at full, really loud) and screen went black.
• PC would turn off and on.
• I removed the battery and turned off the PC, waiting till the internal green light went off.
• Note: It was not due to having to cool off. 1 time, I waited for 1 hour and it would not turn off until I unplugged. An other time I unplugged it instantly and it worked again.
• It started again fine.
• 3 hours later, same problem.

A TL;DR of the current problem:

• When I plug it the PC from a new, it boots automatically, even without me switching it on.
• It boot cycles 2-3 times.
• Then it works 2-3 hours.
• It goes off with a loud noise and does not start again (nothing happens when I press the power button) until I full power off the system (plug out, wait 10 sec).
• Cycle repeats.

What could it be? CPU? CMOS? BIOS? PSU? Memory (I ran an internal test. It started very slow, said 7 min. After about 2-3 min it went very fast and finished. Said no problems. Everything checked out fine)?
Any ideas?

Cheers.

 

[EvilHamster]

I think I have solved it. I think it is the bios trying to update via the internet that is causing some issue. I turned that off in BIOS and it seems to be stable now (no reboot in 2 days and counting). I kind hope that is it .

Anyway, if anyone has the same issue, maybe also something to try.

Cheers.