dual bios

I have an ASRock Z270 Supercarrier and used the Internet Flash utility in UEFI setup to upgrade the BIOS from 1.10 to 1.11. The upgrade process completed successfully and no errors were reported. However, when the computer rebooted with the new BIOS, it just hung with a blackscreen. I have...

I have a Asus P8B75-M-LX that I purchased as a working board, but it didn't. Trying to figure out what's wrong with it. Tested supported processors from first bios version, several RAMs but it does not work. Sympthoms: when plugged in, I get onboard green led lit. When I short Power-On jumper...