[New Build] BIOS only appears with no GPU installed...

Not only am I a complete noob at this (i've done as much reading as i can) but i am attempting to build a high sierra machine from scratch (i started all this days after losing Sierra from the app store)

My question is this: is it normal that i can only boot using integrated graphics for now? If i proceed with OS X install etc, I'll presumably get the chance later on to add the new NVIDIA web drivers and add the card back in at that point? At the moment if i boot with the GPU installed, i get no BIOS screen.

Kit: *GIGABYTE GA-Z270X-UD3 *EVGA GeForce GTX 1060 6GB SSC *Intel Core i7-7700K *Corsair CP-9020091-UK RM650x 650 W

Appreciate any help/tips. Thanks all.

EDIT: Just to expand on what happens when the GPU is actually installed in the PCI/16 slot, both it's fans spin up. It's LEDs light up. After a few seconds the fans spin down. i have both an HDMI from the mobo and a DVI from the GPU going into the same display so i can test. i'm 99% positive i've attached the GPU to the mobo and the cables form the PSU to it correctly (the headers seem foolproof, and fit fine)

submitted by /u/MooseCannon
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