bgunner
Judicious
Your issue is most likely a setting issue. If the first SSD installed was a gen 3 and the bios setting was set for Gen 3 then Yes this will happen.it is a thing.. i have a 1st gen ssd and it did not boot when i tryed to slot in with my gen 3 ssd, i can do something like that or hdd can hang the process
If the first SSD was a Gen 1 but the Bios setting was changed to Gen 3 then this is where the issue arose.
If the first SSD that was installed was Gen 1 and the BIOS setting was set for Gen 1 then I have no Idea why. Gen 3 and Gen 4 is backwards compatible and able to run at Gen 1 speeds.