Hi, i have i believe 6 usb ports. 2 of them not connected through the mobo, but through a hub i believe. They used to work just fine, then randomly they decided to stop working. I know they have power because when i plug my webcam in it lights up. Nothing is recognized though. I cant charge my ipod or anything like that. Please HELP!!! I have a GIGABYTE nForce4sli GA-K8n-Sli mobo

Do you have an external USB hub or are all of these ports on the actual computer? If this is a custom build try re-installing the USB 2.0 drivers Found Here. You may need to download RSS feed software for your web browser if the page doesn't load correctly.

okay on the PC itself, how many USB ports are on the back and how many are on the front? what make and model of motherboard do you have?