My 2G/4gB isn't recognised by the computer - it says the USB device is unrecognised. In addition, the display lights up, but nothing shows on the screen. While listening, you can switch songs forward and back, and by hit-and-miss change groupings. I have done the 5-second menu with centre button hold reset, but all that happens is the screen goes blank (no light). I hesitate to do the hard reset, because if the thing is unrecognised now, what happens when everything is wiped out?