I have six usb ports in all on my system. 2 in the front and 4 at the back. Now if I go into device manager (in windows xp professional sp2) and check under "Universal Serial Bus Controller" I get the following:- Intel(R) 82801 EB Universal Host Controller - 24D2 Intel(R) 82801 EB Universal Host Controller - 24D4 Intel(R) 82801 EB Universal Host Controller - 24D7 Intel(R) 82801 EB Universal Host Controller - 24DE Intel(R) 82801 EB Universal Host Controller - 24DD USB root hub USB root hub USB root hub USB root hub USB root hub So , you see , though I have physically 6 USB ports, I just see 5 USB controllers and 5 USB root hubs. Why so? Shouldn't there be 6 of those? Also when I try to plug-in a device in one of the USB ports on the front side , it says "USB Device Not Recognized" . Why does this message come . There are no problems when I plug-in devices in the other 5 ports . Thanks for your help. Regards