[QUOTE=Driftwood
But if I go to Boot Priority, it says "The system couldn't find any bootable devices"
Thinking there may be an issue with the M.2, I tried another hard drive with a working OS on several of the SATA ports.
[/QUOTE]
as a test.
Connect ONLY 1 spare BLANK HD (no M.2)
Do a clean install of Win10 & see if that boots
It may be some weird UEFI/safe boot issue , or some motherboards have a stupid RAID option that can screw things up (perhaps your old board was setup as bootable RAID single drives)
The best option with a new MB & CPU is a clean install.
Sometimes if you take a HD from another system it wont boot on a new MB/pc , especially if the new MB is significantly different .
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