I recently set my BIOS settings to default while running head, and I noticed that my screen would go entirely white a moment or two after the copyright messages are displayed. I could still log into the system via SSH.
I've confirmed that the BIOS reset re-enabled my onboard Haswell graphics (I have an i7-4770K) and I assume this caused a conflict with my nvidia adapter. This appeared to occur even though the system was not configured to load the nvidia driver at that time.
I thought this might be unexpected behavior.
My apologies, i neglected to explicitly state that after I re-disabled the Haswell graphics, everything returned to normal.
This issue is present in 11.1R, but wasn't present in 10.3R. This is on a Dell Optiplex 9020 with an Nvidia card installed. To remove the white screen I had to select "auto" in the Video options in the BIOS (rather than select the Nvidia card). The auto apparently disables the onboard graphics.