Random shut downs...please help!

[Eromtap]

My pc has been randomly shutting down for the last several days. No error codes or anything. Sometimes it will stay on for 10 minutes, other times 2. When it powers off it waits a couple seconds and tries to reboot. Generally if I let it try to reboot itself it goes into a boot loop and just keeps powering down and retrying. If i kill the power for a minute then restart it will load os and then a few minutes later....blam...same issue. This is a dual booted system and it does it with both windows and linux, plus I've booted from a clean ubuntu flash drive and it still does it so I'm pretty sure I've ruled out a software issue (pretty sure?). There have been no recent changes to hardware. Currently running a 9th gen I5 with upgraded air cooler, r 580 gpu, evga 850 gold rated psu, on an Asus prime 350 ma mobo (intend on upgrading cpu and mobo eventually) and 16 gig of ram. It's just so weird, I thought it was a power issue but the thing will load into BIOS and run fine, as soon as it boots into an os it shuts down within minutes. Oh, I've checked cpu temps and they havent gotten above 30° before it shuts down so that's not the issue. I'm at a loss. The loading bios is what is throwing me off, it cant be the psu or restart button otherwise it would show the same issue in bios right? Please help, this is getting super annoying. Changed outlets and plugged directly to wall to rule out back up power supply and surge protector as poss causes. Also all components are only maybe 6 months old. I built it back in april and it's been running fine till now. I'm at a loss honestly dont know what to do at this point except start buying components and swapping them one by one which would get very expensive...anyone have advise? Thanks in advance!

[Mnky313]

have you checked GPU temps? If you have to wait before turning it back on it sounds like something is overheating, most likely GPU but it could be motherboard VRMs if they are really garbage.

[Eromtap]

1 minute ago, Mnky313 said:

have you checked GPU temps? If you have to wait before turning it back on it sounds like something is overheating, most likely GPU but it could be motherboard VRMs if they are really garbage.

GPU doesnt even get warm before shutdown. Between 25 and 27 degrees according to afterburner. Heat was my first suspect due to it taking a few minutes then not wanting to boot till I let it rest. I wanted to try running it without the gpu to isolate that but the stupid i5 9400f doesnt have integrated graphics. Any way to test the gpu?

[Zmax]

Have you tried a clean install of Windows, this will remove any software glicht.

[Eromtap]

1 minute ago, Zmax said:

Have you tried a clean install of Windows

No, but the ubuntu flash drive I used has was totally fresh. Should I try a windows one as well? I didnt figure it would make a difference. I even unplugged hd and ssd to make sure any rogue files were not able to mess with anything and booted from the usb, same issue.

[UnbounDxKilleR]

Does it give you any errors when the system boots backup? I have had my PSU voltages 12V 5V and 3.3V go astray before which has caused an instant shutdown. 

 

But when that has happened it has been presented to me on start up. Just an idea I am throwing out there  

[Eromtap]

7 minutes ago, UnbounDxKilleR said:

Does it give you any errors when the system boots backup? I have had my PSU voltages 12V 5V and 3.3V go astray before which has caused an instant shutdown. 

 

But when that has happened it has been presented to me on start up. Just an idea I am throwing out there  

Nope,  only error that shows up is after the boot loop it shows the windows recovery screen cause it didnt boot properly

[Eromtap]

For anyone watching this I think I figured it out. The mobo is warped. I was ruling out possibilities. First tried disconnecting power and restart buttons and jumping posts to power on. No change. Tried know good psu. No change. Then I decided to take off the air cooler and try the stock one just to see if the aftermarket cooler was maybe touching some contacts and causing a short. In the process of taking it off i noticed the mobo is warped out toward the back (away from cpu). This was verified with a straight edge. Installed stock cooler and as expected, no change. Best guess is when I installed the cooler I cranked the screws down too tight. I come from an automotive background and am always paranoid about things being loose....bad move here lol. Anyway gonna get a new mobo (was planning on upgrading anyway) and see if that solves the issue, I'm very confident it will. Moral of the story: dont over tighten air cooler mounts....the weird thing is it worked fine for a few months, I guess it slowly bent more and more due to the mounting screws being under spring tension. I will update this post when I am certain of the outcome.

[Eromtap]

Ok, one last update. Took everything out and took a look at mobo with a magnifying glass because the bend I had noticed simply didnt seem like enough to cause the issue. Well long story short in about 10 minutes of searching I found that one of the mosfets for the VRM is cracked down the casing (pic included). Makes sense that the problem was acting like a power issue with 2 known psu's. Anyhoo, for anyone dealing with a similar issue I sincerely hope this thread helps you along.

[Zmax]

Thanks for the update. Glad you found the problem . Good luck

[Eromtap]

12 hours ago, Zmax said:

Thanks for the update. Glad you found the problem . Good luck

Lol no problem, cant stand when someone starts a thread and when you find it it is exactly the problem you have but they never post the outcome so you're left with the same issue and no answers.