There are two usb ports on Gigabyte GA-B75M-D3H. There are 4 additional usb 2.0 ports also available. I had connected my keyboard, mouse and usb hub on the usb 3.0 port. I do not know what happen two ports stopped working. They are not detecting anything. Sometime I get unrecognized usb device error. But sometime there is no response. The other two usb 2.0 ports are working quiet fine. What should I do.
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