G4 USB port not responding
 

Hi All
My iBook G4 has been working fine until few weeks ago when suddenly my usb mouse froze. It wont start moving unless i restart the computer. And since last week both my usb ports have died. Does anyone have any solution for this? I ran the hardware test CD that came with my iBook but there was no problem. Everything else is fine. I really want to avoid sending the iBook to apple as i would have to pay them 250 pounds straight away.
Thanks in advance
Raj

ps: i have all the apple updates installed as i am on a communal network and the updates gets automatically installed evrytime.