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DZ77RE-75K Keyboard and Mouse No Longer Working During Boot After BIOS Flash

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Topic. For some reason, my keyboard and mouse no longer works during boot, which means I can't get into the setup unless I engage the BACK2BIOS button in the back. Actually---this is weird---I think my keyboard and mouse might have limited functionality, since hitting the key (F7?) does bring me into the boot options menu...but F2 does nothing. But when I enter the setup via BACK2BIOS, my keyboard and mouse are definitely dead.

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