Thanks for joining the Intel desktop boards community.
I understand you are not getting any video until starts to load the operating system.
It appears to be a BIOS issue, try updating to the latest bios:
I regret to inform you that there is no keystroke that may help changing BIOS settings without screen.
Thanks for your answer. I did, however just flash the BIOS with that very version (I did it in the last week or two). Like I said in my original post, all it seemed to solve was an issue with the sound controller not behaving with Windows which had more recently cropped up. Beyond that, any ideas? Or should I inquire about warranty replacement do you think?