did you install these Chipset
Intel(R) Management Engine Interface V19220.127.116.110 for Windows 10 64-bit.(WHQL)
Intel(R) Chipset Software Installation Utility V10.1.18263.8193 for Windows 10 64-bit.(WHQL)
Intel Chipset Driver
Right click the start button and Power & shutdown.
Or simply winkey+x and uu for power & shutdown.
I would try a fresh install of windows if I was you. One last go before you send it back in.
Thanks for the input.. I can't shut the board down using the power button either. Not sure how windows would play in this scenario
Reinstall windows as a test on a new hard drive or completely clean partition. Heck, grab a USB drive and install Linux or Ubuntu on it. If it shuts down in Ubuntu then you instantly know its your migrated windows causing it.
You do have a USB drive, don't you? Or a spare disk drive sitting around?
Installing Linux on a usb drive would take mere minutes with Rufus or another linux iso installer.
If you do a windows install on a new disk drive, remove the one with the existing windows boot sector to avoid issues as that is just a shutdown test.
Sounds like you took a Z390 windows install and put it on Z490 or something.
I didn't migrate windows. I purchased 2 new 1tb 970 evo plus SSD's and loaded fresh windows.. I am selling my old Z390 Apex, the i9-9900k and 2 970 Pro ssds as a package so I didn't break them up. ASUS already confirmed it is hardware during our troubleshooting session.