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I have a P9x79 Pro motherboard that worked fine up until a couple of days ago. Randomly (I can't remember if it was during use or after reboot), the USB 3.0 ports on the motherboard stopped recognizing USB 2.0 devices.

They still recognize USB 3.0 devices just fine and the USB 2.0 devices work perfectly on USB 2.0 ports.

The external USB 2.0 drives will begin to spin up when plugged into a USB 3.0 port and then won't do anything at all.

I tried uninstalling/reinstalling both of the USB 3.0 drivers on ASUS's website:
Version, Version

That had no affect. I called ASUS tech support and they just recommended reinstalling the USB driver as well.

Has anyone ever encountered this issue? Thanks so much for any advice you can give!