Bios issue. Help?

Mar 10, 2018
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Just got a new pc and went to update the bios and screen went black and never came to again. I used the windows Bois updater and my motherboard is an asrock Z370M-ITX/ac. Everything receives power just no picture. I have tried switching hdmi.
 

Welcome to Tom's!
I realize that this is a little late, but why did you want to update your BIOS? Updating a BIOS falls into the "If it ain't broke, Don't fix it!" category. You should only update a BIOS to A: correct a known error(will be documented in the release notes for the BIOS), or B: gain additional functionality(such as support for a new CPU). You should never update a BIOS just to have "The latest and Greatest" version.
Second, If you were needing to update the BIOS, I would ONLY use the procedure listed in the Owner's manual, not while running under Windows! You may have to go to Asrock for help.