idiot having usb port trouble...please help!

I'm hoping someone can help me...I'm a little computer stupid, so maybe this is something simple. I have a g4 powerbook and suddenly as of yesterday neither of my usb ports work. I just did a software update, so maybe it's related? I have a mouse plugged in, and the red light is on...it just doesn't do anything when I move it. And I have my ipod plugged into the other port. It IS charging, it's just that nothing shows up on desktop or in itunes....so they kind of work, but they kind of don't. Is this something simple that I can fix? Anyone? THANKS!

 

Try uninstalling the update, as some do cause all sorts of unexplicable problems.
You do not say which op you are using, but if XP , can you not try syatem restore.?
In other threads, usb going down, seems to be common, and can be to do with motherboard.
If the restore, or, uninstall update does not fix the problem, keep looking in as more help from majorgeeks, usually follows.