Hackintosh won't display BIOS if I have a USB or SSD plugged in

I've got my first build up and running and everything looks fantastic. The only issue I'm having is the BIOS still will not display if I have a hardrive plugged in. But if I unplug them then it will come up fine.

Even plugging in a blank USB flash drive will stop bios from loading past the splash screen and only show black

Do you have any ideas? Do you think this might cause issues down the line? Everything else including audio is working great so I don't want to mess anything up.

Asus Prime z370a

i5 8400

Sapphire nitro+ rx580

corsair 8gb 2133 x2

Samsung 860 EVO 250gb

WD 4tb

mojave

I have reset the CMOS and the MB is up to date. This happened on my old machine too so I'm thinking it's a config issue or a ktext problem but I'm not sure which it could be. Any and all suggestions are welcome!

submitted by /u/Brooktree
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