Question System keeps booting from old HDD

Jul 21, 2019
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Hey all, first time posting on this forum.

So this morning I hooked up my old laptop hard drive to my PC to try to retrieve the files off of it. However when I tried to start up my PC it was taking forever to boot which I suspected was because it was trying to boot from the old HDD. I tried changing the boot priority and even boot override but nothing seems to work. I finally disconnected the hard drive and now everything is back to normal but I still wanna try and get my files off the old hard drive. Can anyone help me with this?

Mobo: Maximus X Hero (Wifi-ac)