Question Computer reboots after a couple minutes of activity - out of ideas

Jan 7, 2021
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Hi there all! I'm sorry to register just to drop a question on you, but I'm desperate and out of ideas. A couple months ago, my computer started rebooting for no apparent reason. I thought it was my sort-of-old PSU, so I immediately changed that without a second thought.

Of course it wasn't that. Since then I've tried the following (one at a time ofc)

  • Changed the PSU (Just here for completeness)
  • Disabled automatic reset.
  • Checked temps (all fine)
  • Tried different mobo + CPU.
  • Tried two different GPUs, both discrete and integrated (with the old CPU)
  • Memtest came clean, still tried a different RAM module
  • Formatted and repartitioned.
  • Installed Ubuntu (I usually use Windows 10)
  • Swapped four different HDs.
  • Changed all cables, from power cable to LAN cable.
  • Tried four different wall sockets in several different rooms in several different floors.
  • Removed front panel cables and jumped the mobo on.
  • Tried different peripherals (all of them)
  • Different case (I know, I just was out of options)
Nothing worked so far. I switch on the computer and in less than a minute, it resets. No "resetting..." message, just a "clok" sound. Sometimes I think the lights dim or flicker when the computer resets. It also seems to take less time if I'm connected to the Internet but this might be me. Btw, I don't know if this is related, but after a couple resets it stops letting me go into the Bios menu unless I reset CMOS.

I'm literally at a loss and I don't know what else to try.

My current specs are:

i5 10400F
16 GB DDR4 2666
Gigabyte UD B460M-DS3H
ADATA M.2 512GB + 3TB HD
3070 FE
EVGA Supernova G2 750V

For what's worth, I have two other computers at home, one with a 500V PSU and another one with a 550V - both work without problems in the same wall sockets where my PC reboots. I'm starting to suspect a wiring issue. Back in november, the power company changed the meter while we were out and without letting us know so we could switch things off, and they fried a led growth lamp my wife has for her plants. We let it slide back then but the problems started like a week or two afterwards.

Any ideas? Anything will be more than appreciated as I'm just thinking about calling an electrician now.
 
Jan 7, 2021
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Have you tried shutting down and unplugging the other two from the "same wall socket"?
Sorry if I didn't explain myself properly - the other two computers are in different wall sockets right now.

However they always work no matter where I plug them - this computer doesn't no matter where I plug it. (In my house)
 
Jan 7, 2021
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Update: took the computer to a friend's house, same problem. I guess I'll just take it to a shop... If I can find one open during lockdown
 

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