[solved] unwanted power off, requires hard restart, good PSU & MB & HDD [PSU]

galen · 12-22-2018, 09:55 AM

my k8 desktop system has recently started to power off after less than a minute of power on.

I have checked and cleaned the MB & fans.
I run memtest+ RAM weekly & it is good.
I always enable smartdrive and SSD remains good
I have booted from USB sticks and system will power off in less than a minute.
I have reset the BIOS and tested optimized & failsafe modes, power off still happens.
BIOS reports PSU is good, no fluctuations or over voltage.

I removed SSD, video card, optical drive. still have problems.

MB is Gigabyte GA78LMT, an ultra-stable MB they claim

what else ?

kernel is always kept up to date, 4.15.0-45

is it possible kernel or worm infected BIOS even after reset?

Rickkkk · 12-22-2018, 11:37 AM

Hi galen,

Sounds more to me like a CPU temperature issue than a software infection of some kind. You've already done some good hardware and BIOS troubleshooting - have you looked into the temperature thing ? Even though your fans check out OK, maybe it's a heatsink-thermal paste-CPU based problem.

There are utilities out there (memory fails me as to their names ... *sigh*) to look into this. If you choose to do so and can't find them, feel free to return for more help.

Can't think of anything else at the moment ...

galen · 12-22-2018, 12:12 PM

Oops I forgot to mention BIOS diags reports CPU temp 42-51c.
I also checked for shorts, screwdrivers, screws, wires etc.. nothing.
checked for AC on PSU outputs, none found

jsbjsb001 · 12-22-2018, 12:49 PM

Based on what you've said, I'd agree with Rickkkk. It wouldn't be related to the operating system if it's happening with any system you try.

Did you check to see if thermal paste under the processor's heat sink is worn out? If not, I'd check that.

galen · 12-22-2018, 01:25 PM

solved, I hope.

It was the PSU, I downgraded to an older PSU and no stopage

CPU and MB are fairly new and I had used premium paste on assembly

rokytnji · 12-22-2018, 06:12 PM

Code:

dmesg

sometimes helps me out with issues like yours.

galen · 12-23-2018, 09:02 AM

Quote:

Originally Posted by rokytnji

Code:

dmesg

sometimes helps me out with issues like yours.

yes I always use

Code:

dmesg -w

it could not detect anything since the PSU just shutoff

Rickkkk · 12-23-2018, 09:24 AM

Quote:

Originally Posted by galen

solved, I hope.

It was the PSU, I downgraded to an older PSU and no stopage

CPU and MB are fairly and I had used premium paste on assembly

Good news galen - cheers !

Rick