dkrift :
I have the same issue. What was your fix?
I also had the same issue, with a P8H77-V motherboard. In my case I have an internal USB 3.0 card reader that I have plugged into the USB 3.0 port on the motherboard. After my initial build, the card reader was working (power light was on, device manager listed a bunch of storage devices, and I was able to download photos off a CF card), but then after a Windows Update it stopped working (power light was off, device manager listed the USB 3.0 port as "working" but it had no storage devices).
Here are the steps I did to get it working again. I don't recommend that you repeat them all, but hopefully it helps someone else solve this problem:
- In Device Manager, uninstall the USB 3.0 driver.
- Insert Asus driver disk and reinstall the driver.
- Reboot.
- Observe that the device still doesn't work.
- Power off the machine and unplug everything.
- Open it up and unplug the card reader from the motherboard.
- Plug the card reader back in, but notice that it doesn't seat properly.
- Unplug it again and notice that you bent one of the pins.
- Swear a lot.
- Carefully bend the pin back and carefully plug the card back into the motherboard again.
- Unplug it again in a paranoid attempt to make sure you didn't bend another pin.
- Carefully plug it back in again.
- Attach the power cord, the monitor, and the keyboard, but nothing else.
- Boot the machine and observe that it still doesn't work.
- Get frustrated browsing the web with just the keyboard and decide to plug in your mouse.
- Accidentally knock the monitor cable off the video card in the process.
- Plug the monitor cable back in and notice that your stupid monitor no longer wants to show you anything except an error message about an invalid input format.
- Press the reset button.
- Observe that nothing happens. Strange. Aren't reset buttons supposed to reset the computer? I will have to try that again one day.
- Press the power button, and observe that the machine shuts off.
- Tap a key on the keyboard and the computer comes back on. Hmmm. Was the computer just asleep, or does this motherboard have some sort of boot-on-keyboard function?
- Observe that everything is magically working again, seemingly no thanks to anything you might have done.
So, I'm not sure if this is helpful or not, but this is what I did to solve the problem. I'm betting that this thing is going to stop working for me again one day real soon and I'm going to be quite annoyed again.