USB 3.0 stopped working on z68

I have a z68 extreme 4 gen 3 and everything was working fine but one day my power went out for a second and shut down my computer. When I booted it back up, I noticed that usb 3.0 stopped working. (everything else is working fine). In my device manager i noticed that the USB 3.0 was labeled multimedia audio controller (it disspeaered when i disabled usb 3.0 in bios) and had that yellow exclamination point next to it. I have tried uninstalling in device manager but it just comes back and window says driver was not succesfully installed. I have also tried reinstalling the driver. can anyone help
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More about stopped working
  1. have you tried clearing cmos?
  2. would clearing the cmos do anything? i want to be certain before i mess around with the cmos
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