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I tried that. Unfortunately it didn't seem to make a difference. Thanks anyways though.

Yes, it was.

Secure boot has been turned off.
Unfortunately I can not put the main hard drive at the bottom of the boot order, since (as stated in the title) BIOS can not see the external drive.

Recently I attempted to install Kali on an external hard drive, since my internal drive was pretty much full. I managed to get through the installation after a few problems that were eventually...