Kindly advise: I have had my Seagate 3TB HDD for a few years, no longer under warranty. The driver suddenly dissapeared from file manager (Windows 7). I can hear the drive running, but the light does not come on. I have tried to connect to another PC and the same happens. So there is power to the drive, but the PC does not pick it up. It stopped working while I was busy extracting information from it. Very puzzled and any advise will be much appreciated.