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Shutdown stalls and audio problems with PRIME B360M-A

Level 7
I built my PC in early 2019 and it has been smooth sailing up until a few months ago.
Sometimes the computer fails to completely shut down. The display turns off and the fans reduce speed but remain on. I have to force shut down holding the power button.

I have a dual boot with Windows and macOS on separate SSDs. I primarily use macOS so I thought it was a hackintosh related problem.... until I noticed that it happens in Windows as well.

Another weird thing is while the shutdown stall happens at least a couple times a week, every ONCE in a while the audio won't be working in either operating system when I turn the computer back on. I.e. the audio option is completely greyed out. I can usually fix this by powering it off a couple times then the audio will be back.
I'd say the issue with the audio failing happens maybe 5-10% of time the shutdown stall happens.

Due to this happening in both my OS's I'm thinking it could be a failing PSU or motherboard. I'm wondering if anyone else has this problem with an ASUS board or if there's some way for me to troubleshoot / diagnose the problem. Thanks.

Seasonic Focus Gold 600w PSU
3.6ghz Intel i3 8100 Quad Core
16GB Ballistix DDR4
Sapphire Radeon RX 580 8GB
Samsung EVO 500gb SSD, Western Digital 1TB SSD

Super Moderator

Despite it happening in both operating systems I would be tempted to install a fresh dummy OS on a separate drive and see if the problem persists there. A failing PSU will often result in random rebooting rather than any system stalls or hangs, and they would be sporadic based on load, not repetitious.

Try installing a dummy OS and update the UEFI to the latest available version from the ASUS Support portal.
13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

I unfortunately don't have a spare drive to install a dummy OS on. Both my external HDD's are used for important backups. I do have a bootable backup that's a clone of my macOS drive, but that would defeat the purpose.

Also I believe I'm already using the newest UEFI.

Any ideas?

BobTheCat wrote:
Any ideas?

As above, really. You want to be testing on a fresh OS before spending much more time debugging. Might be an idea to start making image backups so it's not such a hardship every time.
13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Like I said, I do have a couple backups, which are fully bootable and function as intended. So yeah in a way I've already done what you've said, I have three separate drives that all boot fine. My BIOS is updated, drivers updated, everything software related has been troubleshooted already.

Doing yet another OS install for troubleshooting seems like a waste of time and money when the issue is 99% sure hardware related.