I have been regularly encountering an issue with a USB keyboard and mouse, where the mouse pointer freezes, and the keyboard experiences missed or delayed keystrokes. After approximately two seconds, it would unfreeze again, but the problem would reoccur almost immediately.
Having now found a solution, I thought I would share it in case anyone else is experiencing the same issue.
When you reboot your computer which has an ASUS X99 Deluxe-II motherboard, it goes through the POST fine, but when it hands over to the OS, you get a black screen with a flashing text cursor in the top left corner. Examining the Q-code display on the motherboard shows error “AE”.
It’s not clear why this happens. From various searches on the web, it would seem that this could be due to a badly behaved USB device. It’s certainly not Operating System specific as it happens even when trying to boot from CD/DVD.
It also seems to be independent of BIOS version, as I have seen it happen with the factory-shipped BIOS, and also 1601 and 1701.
Check all USB devices, connecting each one in turn until you find the culprit. In my case it was a Sony PS2 controller to USB adaptor I was using.
If the above solution doesn’t solve it, the following workarounds may help you:
Power down the computer completely including switching off the power supply (it helps if your PSU has a power switch), wait 10-15 seconds until all lights on the motherboard have extinguished, and then power back on again.
A full CMOS reset with the small reset button on the motherboard often fixes it, but this is very inconvenient as you then need to setup your BIOS again.