PC won't completely shut down

[Zepher]

Wondering what would cause a PC not to shut down completely.

I sold a friend my i7 2600K, Asus P8P67 Pro about 9 years ago and he was having issues with it recently where it would power off shortly after powering on, then repeat, or it would post and boot into windows 10 but randomly just shut off and restart.

I swapped out the PSU and it was able to consistently post and boot into Windows but when you shut down, windows shuts down but the PC stays powered on. you have to hold the power button down for 3+ seconds to get it turn off.

I hooked up the original PSU and now it consistently Posts and boots into windows but still won't shut down.

I think maybe the flaky PSU did something to the motherboard causing it not to shut down.

Also, I couldn't update to the newest BIOS, gave me a file integrity error when it was verifying the BIOS I downloaded from Asus, downloaded it twice to verify.

I did backup the stock BIOS and that was able to be read and verified, so not sure what is up with the newer BIOS from Asus's site..

 

[hititnquitit]

Sounds like a flakey mb. If possible test his gear with another mb. Being so old thats probably not going to be easy

Edit
Ive got a spare msi z68 something something mb lying around here somewhere. It worked perfectly with my 2600k the last time i used it...a year or so ago.

 

[Zepher]

Sounds like a flakey mb. If possible test his gear with another mb. Being so old thats probably not going to be easy

Edit
Ive got a spare msi z68 something something mb lying around here somewhere. It worked perfectly with my 2600k the last time i used it...a year or so ago.

I actually got it working properly. Turns out the BIOS needed to be cleared, after clearing it the PC would turn completely off. Also, the GPU was faulty.
GPU could have damaged the PSU or more likely the PSU damage it.
But with a different GPU and a new PSU the machine operates perfectly.