Windows 7 does not recognise my hard drive

WD External Drives WD Portable Drives
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If you can’t see the drive in disk management, then either the bridge board (the case) failed, or your os has not install the drivers properly.  Have you tried updating your usb 3.0 drivers?  that’s done through your pc manufacturer.  have you even installed the drivers?  if your media player recognizes it and can play media from it, that’s because it’s accessing the drive from usb 2.0.   so, either the usb 3.0 port has failed, or it doesn’t have the drivers installed.  try connecting the drive to your pc using just usb 2.0 cable and see if that works.