Hi there again, Warren_7!
So as far as I understand the issue is getting into BIOS, right? In this case, you should know that this depends on the motherboard manufacturer. They have different access keys to BIOS. My recommendation is to check
this guide and, hopefully, it would help you set things up in BIOS and install Windows successfully.
If the issue is still present and you can't get anywhere else besides the Black screen, you should try
resetting your BIOS settings back to factory defaults by reseating the CMOS battery or resetting the jumper on the mobo.
Give these a try and let me know how it goes!

SuperSoph_WD