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Lost ability to shutdown and no display output when returning from sleep.

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Hi, I have Catalina running on a Z390 Designare with 9900K. I was recently messing with the bios to overclock and undervolt the i9900K and now my Catalina will not shutdown when selected, it only restarts (possibly some kernel panic on shutdown. Also when the computer goes to sleep, upon wake, I get no HDMI output signal (or any signal) and have to hold power button and restart.

Can someone please help me troubleshoot as to what may be the cause of this issue?


My EFI is too large to post here apparently, so here's a link to download my EFI: https://we.tl/t-0xdwcCcLle


Many thanks to anyone who attempts to help obviously.


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