Trying to install new GPU

check the ahci setting in bios and toggle it to see if windows boots.

You cannot flip ahci on/off on a whim without issues once windows is installed, and the bios upgrade may have switched it.
 
I have an old Z68xp ud3 and when I flashed the bios it would reset to ide and windows wouldn't find a drive to boot, in my case just changing the option to ahci worked.
 
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