I have a desktop hp 6200. With Win7 pro everything functions as it should. With win10 pro, if I restart the PC, I never see the hp splash screen and cannot access the bios. After ~2.5 minutes win10 loads and everything works as it should.. If I shut down the machine, then turn it on it works as it should. I see the HP splash screen, can access the bios, and win10 loads in under a minute.
The issue seems to only be with restart.