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ROG MAXIMUS XI unable to detect bootable device

MaxPowers1983
Level 7
I recently put together a new computer and reused an SSD that has windows already installed in it. I turned on the computer and it went into bios intial set up. It does not detect the SSD as a bootable device. It does detect the SSD as a storage device. boot options priorities and boot override are both grayed out. Error code on MoBo is A9 I have tried both with and with out the GPU plugged in.

Maximus xi hero
i7 8700k
Samsung SSD 850 evo 500 GB
980 ti
16GB 3200 DDR4
415 Views
1 REPLY 1

Menthol
Level 14
My guess is the OS was installed in legacy mode instead of UEFI, you may need to change boot settings in the bios, enable CSM, UEFI and Legacy boot