I had the exact problem yesterday with my Logitech K800 remote Keyboard, was also not able to enter the bios.
Did a clear cmos and this did the trick, but I also had problems with my previous GB Z77 mb, these new
motherboards do not like remote keyboard receivers.
Believe it might be the usb 3.0 issue which is causing this, when i did a clean W7 install I had to use a old
wired keyboard, otherwise I was not even able to install w7.
So based on the above I assume wireless keyboards are still a issue with these motherboards.
My Mouse the Logitech Mx Revolution mouse and K800 keyboard are connected via 1 logitech receiver.