I have just recently bought a new all singing and dancing (I think) PC. The problems (setting I hope) is that sometime on restart or after sleep I'm told that one or more USB ports are not recognised, try another port. When I do this or even just take out and put back in again it works okay. I have only two usb devices on at the moment, a Linksys Wi-Fi adaptor and a Logitech cordles mouse. One or other of them will not operate randomly at times until I do the above.