Hello guys. I am new here. I am having a problem with a printer plugged into a usb hub. I have a Radio Shack powered USB hub with a 10ft USB ext cable and a 15ft usb cable. It is all connected to a HP 2420. If you plug the printer into the 15ft cable direct to the computer it works fine. If you hook it to the hub it shows up with an UNknown device. What could my problem be? Thanks for any help.