If this isn't the case, it's probably a hardware issue. Either a damaged port or damaged controller. Neither of which is good.
I have a Dell 4500 desk top, running XP Home, and a Compaq 2500 laptop, XP Professional.
My question is this, are all USB ports functional or do they need to be activated in some fashion.
On both computers some ports seem to work while others act as if they are not functioning.
Thanks for any help provided.