Le 27/06/2022 à 03:32, Alexander Shenkin a écrit :

Ok all.  I've put in the new mobo + CPU, and the BIOS isn't finding any 
bootable devices.  Suggestions for next steps?  Thanks in advance...

Was the system originally installed for BIOS or EFI boot ?

If BIOS, was the bootloader installed in the MBR of all drives ? Does 
the new motherboard support BIOS/legacy boot ?

If EFI, was a copy of the boot loader installed in the "removable media 
path" (\EFI\Boot\Bootx64.efi) of the EFI partition(s) ?