Computer forgets BOOT drive

[FarquaadFuqwad]

ISSUE: If my computer shuts down or restarts, I get a black screen telling me to install a boot drive (hit any button to continue).  Nothing fixes it except clearing CMOS.  I remove power, remove and then reinstall the motherboard battery, power back up and get into BIOS. Then I need to go to the F11 boot menu and select CSM config -> Enable (UEFI) and my PC boots up normally again.

 

Is my motherboard dying? Battery? Memory? please help!!

 

Windows Memory Diagnostics -> no issues found

 

Motherboard - Prime Z390 Series

CPU - Intel 9700K

GPU - Radeon 6800

M.2 - 1 TB Samsung EVO (boot drive) / 2 TB Samsung EVO Plus

Air cooled system (temps are always normal)

PSU - Corsair 850w

 

 

[av1ty]

I think you should definitely try getting a new battery.