Re: Dr. Debug A2 Code On Asrock Z77 Extreme4 Mobo - Help Needed!
Since the keyboard doesn't react, wondering If you tried with another keyboard?
Also try different ports from different controllers like usb2, usb3, chipset, 3rd party controllers (if the board had them, not checked). Had trouble with one mainboard when keyboard used USB3 port until I updated the BIOS.
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