Can you provide us more info? And what do you mean by "...I have also built this PC in June so keep that in mind"
Hard drive connector? Are you referring to an external drive with an USB?
Anyways, I agree with R. Proffitt, make sure your primary (boot) drive is connected to 0 or 1 (lowest SATA ports).
So when I plugin something with a hard drive connector. My PC will not boot from its Windows partition. I don't know if this is a BIOS setting that I don't want on or something else that is what I need help clarifying. I have also built this PC in June so keep that in mind.

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