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Custom Build - Randomly Reboots *Need Help!!*

I

IShadesl

n00b
Joined
Jul 13, 2016
Messages
21
Hello all,

I have a very troubling issue I've been working on the last few days and I can't seem to find any solution and it's really getting to me!

I'm helping a friend with his custom PC, he purchased from CyberPowerPC. It's out of warranty and was working fine until about a week ago.
The PC randomly reboots, does not seem to be related to anything that I do or not do but 9/10 I am doing something in Windows/Browser/Settings but it has rebooted with me not touching anything.
Has not rebooted in BIOS or while running MemTest.
It will randomly reboot at login or Windows anywhere from 30 seconds in to 5-10 minutes in. The only time I got it to not restart is with a different PSU & different RAM. With different RAM alone - it reboots. With different PSU alone - it reboots. With both of those, it did not reboot the entire night, but I was not using it - just had several browsers open, apps, etc.
The other issue I've noticed is when I select Shut Down from start menu of Windows it just reboots instead of turning off. Everything is connected correctly on the motherboard.

Gigabyte 970A-DS3P V2.0
AMD FX-8350 4.0 Ghz
Radeon R9 390x
2x4 GB (8 gb) XPG Adata Memory
240 GB ScanDisk SSD
1 TB Toshiba 6 gb/s HDD
EVGA NEX 750
Enermax CPU Water Cooler
Windows 10 Home

(No OC'd at all)

The thing's I've currently tried and problem still persisted:

PSU tested good w/ multiple PSU testers
MemTest was good
HDD Regen good
Tried to boot w/ Windows 10 Home & Ubuntu (not installed)
Changed PSU (swapped for EVGA 750 B2)
Changed RAM (swapped for 2x4 GB Corsair 1600 mhz)
Changed GPU (swapped for EVGA GTX 660)
Booted w/ 1 HDD connected
SFC Scan good
Stress Test/Benchmarking tests on all hardware does not seem to trigger anything
Reinstalled/Updated Windows Drivers for a lot of hardware
Clean Boot
Safe Mode
Default Settings in BIOS
Fast Boot Disabled

I've watched the temps and voltage but doesn't seem to spike or move much.
CPU Operating Temp: 25-34C
System Temp: 28C

The one thing I'm not sure on is the way the Disks/Partitions are setup, I do not know if he did it this way or CyberPower and it may not be an issue at all. I only mention this because I'm not familiar with the way this is setup and the issue still happened in Ubuntu, but I did not install Ubuntu or have it's own HDD/Partition or anything like that.
He has reinstalled Windows 10 since this starting happening, I do not know if he reformated or how he went about it specifically.

Disk 0: System Reserved 800 MB NTFS Healthy, System, Active, Primary
Data E: 931.2 GB NTFS Healthy, Primary

(SSD)Disk 1: C: 238.47 GB NTFS Healthy (Boot, Page File, Crash Dump, Primary)


Any help, idea's, thoughts, suggestions are welcome and appreciated!!
 
modi123 said:
Anything specific in the event viewer?
Click to expand...

Ah yes, thank you for reminding me!

I'm currently testing the 2nd HDD (1 TB) right now that I know that it's partitioned this way, so I can't boot the computer right this moment.

There were several errors under Windows >System that said it was "Unspecified". These would appear each time shortly before a reboot, as well as after. I can get the specifics once this is finish scanning.

As far as the way the HDD's are partitioned the guy said he did not partition them that way. When he reinstalled Windows, he deleted all the old partitions, selected the SSD to install and it did it like this on it's own.
Not sure if that would be a possibility or not but he has given me the go ahead to do a fresh install of Windows if I need to.
 
Sounds like a PSU or MB issue to me...If it happened in W10 and Ubuntu, I don't think it's OS or software related. I'd recommend pulling it out and bench-testing for a while to see if something is shorting on the case, or see if you can recreate the problem by flexing the board a bit.
 
Bandalo said:
Sounds like a PSU or MB issue to me...If it happened in W10 and Ubuntu, I don't think it's OS or software related. I'd recommend pulling it out and bench-testing for a while to see if something is shorting on the case, or see if you can recreate the problem by flexing the board a bit.
Click to expand...

Think it maybe a PSU issue even if it was happening with a different PSU of same power?
When you mentioned pulling it out and bench testing it - do you mean just hook it up outside of the case and running tests via Windows?
 
IShadesl said:
Think it maybe a PSU issue even if it was happening with a different PSU of same power?
When you mentioned pulling it out and bench testing it - do you mean just hook it up outside of the case and running tests via Windows?
Click to expand...

I'd pull the MB and everything from the case and test it on a desk or a box. I've seen lots of problems caused by case-shorts/grounds, or loose connectors and such. Moving everything will usually help isolate those problems.

I don't think it's a PSU issue if you've already swapped PSUs. It could be a problem with one of the PSU connectors on the MB though.
 
Bandalo said:
I'd pull the MB and everything from the case and test it on a desk or a box. I've seen lots of problems caused by case-shorts/grounds, or loose connectors and such. Moving everything will usually help isolate those problems.

I don't think it's a PSU issue if you've already swapped PSUs. It could be a problem with one of the PSU connectors on the MB though.
Click to expand...

For those would like to know what the issue was:

I reinstalled Windows 10 Home with no success with the issue.
I took the motherboard out of the case and booted that way - issue persisted.
Tested the RAM on a different PC - did fine.
Tested (stress) the GPU on a different PC - did fine.
MemTested the RAM again - no errors after 4-5 passes.
Finally I changed the PSU again, after testing the original PSU with THREE different testers all saying the correct voltage. It ran without issue, while in use/under stress for all of today.

No idea why it rebooted 1x while it had the new PSU installed the first time. Can't explain that. I assume the issue with the original PSU is either amps or inconsistent voltage/power cuts? After I reinstalled Windows the issue seemed to be happening seconds after logging in rather than minutes.

Thank you all for your help and suggestions.
 
IShadesl said:
Finally I changed the PSU again, after testing the original PSU with THREE different testers all saying the correct voltage. It ran without issue, while in use/under stress for all of today.

No idea why it rebooted 1x while it had the new PSU installed the first time. Can't explain that. I assume the issue with the original PSU is either amps or inconsistent voltage/power cuts? After I reinstalled Windows the issue seemed to be happening seconds after logging in rather than minutes.

Thank you all for your help and suggestions.
Click to expand...

How did you test the PSU? No-load voltage is only a very small portion of PSU testing. How that voltage responds under load is the big problem usually.
 
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