Question "missing operating system" after swapping a secondary HDD

Oct 11, 2020
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i have an ssd with win 10 and all my installed programs. i also have 2 hdd's with other files on them. i bought a new hdd, swapped it for one of the old ones, and windows gave me a blue screen. when it rebooted, it just says "missing operating system" even though the OS isn't installed on the old hdd.
so i put back the old hdd, it's now back to its original cofiguration, and it still says "missing operating system"!! i'm stumped now. how is that possible?

all 3 drives are detected in the bios & functioning properly.
 

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