I have this mobo too.

To get into the bios I have to connect to onboard VGA.

And either VGA or PCI to get into windows, and it takes a few for the windows loading screen to come up, be patient.
Basically when my GPU fans quit spinning is when Windows is about to come up onscreen.

This board is temperamental I still haven't mastered it.

When it's running I don't mess with it.