[SOLVED] Sudden reboots without BSOD on a newly built PC

Aug 12, 2020
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Hello everyone.
Recently I helped my friend to build brand new PC. The first day everything was fine, but on the second day and later on he was experiencing sudden reboots. Sometimes reboot would happen just before login screen, sometimes it would happen 20-30 minutes after boot, but it rarely passed the mark of 30 minutes without reboots.
The first thing we've noticed that there is no BSOD, so no dumps to analyze. Secondly, in the event log we've noticed Kernel Power 41 error with task id 63. We've learned that if BugcheckCode is 0 it usually means that there is a hardware issue, most likely with PSU. But we decided to update drivers first hoping it'll help. We've tried different graphic card drivers, we've updated chipset driver and bios. Unfortunately it didn't help. Checking temperature didn't help as well, neither CPU nor GPU goes above 65 degrees celsius on maximum load.
So the first thing we did after that - we swapped PSU with another one and needless to say it didn't help.
Then we've decided to check memory using memtest86, we've booted from the flash which had memtest86 installed on it and ran tests for 4 hours. No issues, no reboots, everything is fine.
We also tried to run Furmark and it was passing most of the time but occasionally we'd get reboots, so we've tried to swap graphic card as well. Sadly it didn't help.
We've also ensured to turn off any CPU overclocking in the BIOS. In the windows settings we've ensured that power options are configured to never turn off any inactive devices and never go to sleep. Finally we've tried to follow this weird guide http://www5d.biglobe.ne.jp/~the_imai/etymology/kp41_en3.html and the issue still persists.
The only thing we can say for sure is that the issue only occurs in Windows, it never happened during BIOS configuration.
Windows 10 was legally obtained from microsoft website https://www.microsoft.com/en-ca/software-download/windows10 and then installed from a bootable flash.
SSD was completely formatted during Windows 10 installation.
Here is the list of hardware installed on a PC:
We are still going to run some tests on a CPU (hopefully we'll be able to find something bootable like memtest86), however at this point we are clueless. Hundreds of articles are already read and no idea what to do next.
If you can give us some advice that'll be really helpful for us. Thank you all in advance.
 
Reactions: brryronnie
Hello everyone.
Recently I helped my friend to build brand new PC. The first day everything was fine, but on the second day and later on he was experiencing sudden reboots. Sometimes reboot would happen just before login screen, sometimes it would happen 20-30 minutes after boot, but it rarely passed the mark of 30 minutes without reboots.
The first thing we've noticed that there is no BSOD, so no dumps to analyze. Secondly, in the event log we've noticed Kernel Power 41 error with task id 63. We've learned that if BugcheckCode is 0 it usually means that there is a hardware issue, most likely with PSU. But we decided to update drivers first hoping it'll help. We've tried different graphic card drivers, we've updated chipset driver and bios. Unfortunately it didn't help. Checking temperature didn't help as well, neither CPU nor GPU goes above 65 degrees celsius on maximum load.
So the first thing we did after that - we swapped PSU with another one and needless to say it didn't help.
Then we've decided to check memory using memtest86, we've booted from the flash which had memtest86 installed on it and ran tests for 4 hours. No issues, no reboots, everything is fine.
We also tried to run Furmark and it was passing most of the time but occasionally we'd get reboots, so we've tried to swap graphic card as well. Sadly it didn't help.
We've also ensured to turn off any CPU overclocking in the BIOS. In the windows settings we've ensured that power options are configured to never turn off any inactive devices and never go to sleep. Finally we've tried to follow this weird guide http://www5d.biglobe.ne.jp/~the_imai/etymology/kp41_en3.html and the issue still persists.
The only thing we can say for sure is that the issue only occurs in Windows, it never happened during BIOS configuration.
Windows 10 was legally obtained from microsoft website https://www.microsoft.com/en-ca/software-download/windows10 and then installed from a bootable flash.
SSD was completely formatted during Windows 10 installation.
Here is the list of hardware installed on a PC:
We are still going to run some tests on a CPU (hopefully we'll be able to find something bootable like memtest86), however at this point we are clueless. Hundreds of articles are already read and no idea what to do next.
If you can give us some advice that'll be really helpful for us. Thank you all in advance.
Did you swap the PSU with a quality unit or a similar low quality one?
 
Aug 12, 2020
5
4
15
0
Actually the PSU listed in the post is the new one. Original PSU was Corsair VS450W. I left a new one in description because we already returned it to the shop and got a CoolerMaster 500W. So old one is not available anymore.
 
Reactions: brryronnie
Aug 12, 2020
5
4
15
0
Another update - we've checked for bent pins, everything seems to be in order. We've also swapped motherboard with this one https://www.asrock.com/MB/AMD/B450M Steel Legend/
Unfortunately, it didn't help.
At this point we've tried to swap multiple PSUs, graphic card and motherboard. Did a good amount of testing of RAM and CPU. What else could it be? I am out of ideas.
 

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