Yesterday I plugged my cell phone into the computer and enabled it to use as usb. Immediately after that I noticed my usb mouse wasn't working and then realized the usb keyboard wasn't working. I tried a different mouse.....and still none of the ports on the computer would work. (They do however work on my laptop) Then I took the following steps.
1. unplugged my usb mouse (and everything else) and tried all the different ports.
2. tried both a different usb mouse as well as wireless mouse (which needed a usb to connect. Nothing was recognized
3. unplugged everything, shut the computer down. Unplugged the computer. Left it like that overnight.
4. When got up turned on the computer then tried to plug in....nothing recognized