I have an IBuyPower computer with a Gigabyte GA-B75M-D3H motherboard, and i5 CPU and 8 GB of memory. I replaced the motherboard a while ago, because it started rebooting every couple of seconds. It worked fine for a while after I replaced the motherboard, then the USB 3 stopped working. I discovered that all I needed to do was go into the setup and save and exit to make it work again. It will work for a few days, then quit again. So I go into the setup and resave it, and it's fine again. For a while - like a few days or a week. This gets tiresome after a while. Any thoughts on what I could do for a permanent fix? I bought the motherboard at NewEgg BTW, I'm running Windows 8.1, with the newest updates.