This has happened several times over the last several months. USB 3.0 ports will be working fine, then out of the goddamn blue for no apparent reason at all, they completely disappear from Windows. They're still physically there, and they're still getting power, but Windows 7 absolutely will NOT acknowledge that they even physically exist on the motherboard. I wish I could reproduce this bug, but I can't, and Google is utterly useless when trying to find out information about this problem.

There is no warning when this happens. If I go into Device Manager and look at the USB ports there is simply no mention at all of the ports. There are no "unknown device" warnings at all. As far as Windows 7 is concerned, there simply are no USB 3.0 ports on the motherboard whatsoever. The motherboard's BIOS says they're hooked up and they're in perfect working order, it's only Windows that won't acknowledge their existence.

I can still hook things up to the USB 2.0 ports, and they work perfectly fine. Also, I've had this problem with another motherboard from a different brand than the one I'm using now, and like with this board, the bug only affected the USB 3.0 ports, but not the 2.0 ports. So I know that this is not a hardware problem.

The thing is, though, I've never had this problem with USB 3.0 until about a year ago, which is when a lot of my other computer problems began. I've replaced literally every important part of this computer and the problems still keep coming back to haunt me. I just don't get it. In another month, the problems will have been with me for a full year. I have no way of knowing what is causing these problems.