System randomly shuts down (not a cooling or fan issue)

[DustinKU]

I built my computer two years ago. It has been running silky smooth up until now. Just recently, it has started to randomly shut down. At first, it would do it during gaming. Then, just idling at the desktop. A few times I successfully was able to log in and navigate Windows for awhile before shutting down. Now, I can't even get to the login screen before shutting down. I can idle at the bios it seems like indefinitely.

I checked the temps at bios and that doesn't seem to be an issue (27-30 C). Fans seem to be operational. PSU fan is working and exhausting air. I was hoping it was Windows, so I created a USB boot drive and tried booting from USB. I was just going to do a clean system wipe (all files are on a separate drive, SSD is used just for critical apps and games) but the system shut down when I tried that as well.

Does anyone know what I should do at this point to single out which component it might be? Here's the build:

MSi Z170A motherboard
i7-6700k
16 gb memory (Crucial)
Nvidia 1080
SSD
EVGA SuperNOVA 750 G2 Power Supply
Enthoo Pro Series Full Tower
Phanteks PH-TC14PE_BK 140mm UFB (Updraft Floating Balance) CPU Cooler

 

[clarkjd]

Random crashes and re-starts, especially when under load (Gaming) tend to be power related. Your EVGA G2 PSU is a top tier unit, but even the best PSU can go bad or be a lemon. See if you can still RMA it under warranty.

 

[DustinKU]

I ended up RMA'ing it. I'll update when I get the new PSU and see if that does the trick.

 

[DustinKU]

Yep, that seems to have been it. EVGA sent the new PSU, I plugged it in and it is working just fine. Thanks for the suggestion.

 

[clarkjd]

Yep, that seems to have been it. EVGA sent the new PSU, I plugged it in and it is working just fine. Thanks for the suggestion.

Glad you got everything working!

 

[DustinKU]

Hopefully resurrecting threads is okay, but the issue has reared its ugly head once again. I have not used the computer much over the past couple months, but have just gotten to the point where I have more time to play some games and started playing more. I'm now back to where the computer will completely shut down before I have a chance to log in again. I have a new PSU that was sent from EVGA so I have to rule that out now.

I thought it might be the case, maybe a faulty power button, but I haven't seen any issues when the Phanteks Enthoo Pro. Maybe the motherboard at this point?

 

[clarkjd]

Hopefully resurrecting threads is okay, but the issue has reared its ugly head once again. I have not used the computer much over the past couple months, but have just gotten to the point where I have more time to play some games and started playing more. I'm now back to where the computer will completely shut down before I have a chance to log in again. I have a new PSU that was sent from EVGA so I have to rule that out now.

I thought it might be the case, maybe a faulty power button, but I haven't seen any issues when the Phanteks Enthoo Pro. Maybe the motherboard at this point?

Make sure that all the connectors from the PSU are fully seated and locked, especially the PCI/E power to your 1080. See if you can re-create the problem by (carefully!) wiggling the connectors.

 

[DustinKU]

Finally, after a couple trips to Micro Center and hours of troubleshooting, the issue was finally found. Turns out that there were some bent USB 3.0 pins on the motherboard that were shorting out the system. Had to replace the motherboard, but it was nice having an excuse to upgrade.