I have a new/old Optiplex 7060 that I recently purchased.

It came with a HDD and win 11 which I removed to install a M.2 SSD

I did a fresh install of win 11 on the M.2 SSD and everything was working fine till I decides to reinstall the old HDD to use as additional storage.

Thats when things went wrong,the PC booted from the old drive instead of the new . I turned it off and removed the HDD and rebooted.The PC failed to recognize the  SSD at all so I tried to change the boot drive in the bios by enabling legacy mode in the hope it would give me the option of selecting the SSD.

I cant seem to reverse the changes I made in the bios  and am wondering what is the best way to proceed.

I have a USB recovery drive and system image back up I created after setting up if that will be of any help.