Question: The USB ports on my notebook computer will not detect anything plugged into them, it was working fine and now it is not how do I correct the problem?
Answer: USB ports not working can be caused by many things. There is a real good chance that they just went bad. Is it one pair of two ports that are connected? If so if one goes bad the other may as well. I've seen it happen before.
Do you have any drivers that came with the computer? See if you can reinstall the USB drivers. You can also check Device Manager for any errors.
You can also try to disable your USB in the BIOS and reboot and see if it gets detected again.