Frustrating PC Shutdown Issue

[BabyPCMR]

Hello all,

 

I have been troubleshooting for close to a month now on this issue and I can't seem to get it figured out, I'm ready to farm this out to people more competent.

 

I have this new PC that was just built, everything is great about it except that it has this annoying tendency to just shut down and start back up again. Sometimes it just does it once and other times it will turn on and shut down multiple times in a row, very random.

 

One pattern I did notice is it only shuts down when it gets to windows at some point. When it is in the middle of restarting multiple times, I can enter the BIOS and it won't restart. But when I exit the BIOS and it loads up Windows it will restart at some point, whether that be right away or 5-10 seconds into Windows.

 

When it does shut down, it won't show the whole "Shutting Down" or "Restarting" text. It just does it.

 

I have checked Event Viewer, and all it says is that the PC shut down abruptly and there may be an issue. Basically nothing useful, just the obvious.

 

I also turned off "automatic restart at system failure" but I still don't get a blue screen, the machine just turns off.

 

Here is what I have tried:

-Ran a test on the RAM using both MemTest and the Windows Memory diagnostics tool, both gave me no errors. Ran them multiple times each.

-Completely replaced the power supply to a different unit.

-Updated the BIOS to the latest version

-Reset the CMOS on the motherboard

-Checked all the pins on the motherboard and the contacts on the CPU, both looked good.

-Checked the SDD, which is the only drive in the system, using windows' disk checker tool. Came back with no issues.

 

 

Side Note: I was going through installing all the drives from the motherboard manufacturer's website, and the RealTek drivers were doing this weird thing where once I have installed them and it prompted me to restart my machine to finish the install, I would restart and then it would restart again on it's own and after the second restart it would prompt me with the RealTek installer Wizard again like I was installing the drivers for the first time. It would do that over and over again until I just hit cancel when the wizard came up again.

Not sure if this is relevant just thought I might throw it in there.

 

 

Thank you in advance to anyone with any input!

[Robchil]

sounds like an unstabile PSU ..  what is your hardware? 

if you tried a psu with more watt, and better rating. i would put a lamp in the power socket and check if it flickers sometimes. 

 

 

[BabyPCMR]

10 minutes ago, Robchil said:

sounds like an unstabile PSU ..  what is your hardware? 

if you tried a psu with more watt, and better rating. i would put a lamp in the power socket and check if it flickers sometimes. 

 

 

It is just a i5-9600k with no GPU. I've used a 450 Watt Corsair Unit and a 500 Watt EVGA unit. It happened with both PSU's and it also happened at my own house and my friend's home. I actually do have a lamp plugged into the same outlet and it works just fine. I really have no idea what the issue might be.

[Robchil]

when it just blacks out and reboots like that and don't in bios... it still sounds like PSU issue.. otherwise it would give you a bluescreen. altho odd, since it's nothing but internal gpu pulling power... could be two faulty psu's? . 

you get what you pay for.. especialy with psu's.. not that you would need much more. 

but PSU is usualy under prioritized, it's the last thing you buy and you get the cheapest that will run the system if your on a budget. 

 

[BabyPCMR]

47 minutes ago, Robchil said:

when it just blacks out and reboots like that and don't in bios... it still sounds like PSU issue.. otherwise it would give you a bluescreen. altho odd, since it's nothing but internal gpu pulling power... could be two faulty psu's? . 

you get what you pay for.. especialy with psu's.. not that you would need much more. 

but PSU is usualy under prioritized, it's the last thing you buy and you get the cheapest that will run the system if your on a budget. 

 

Could this be a symptom of a PSU getting too hot? The case I have it in doesn't seem to give the PSU very much breathing space, but that is only a guess.

[Robchil]

yes