The cd,/dvd burner has stopped working on my Lenovo Ideapad 100 laptop so I've just bought an external cd/ dvd drive/burner. When I plug it into the laptop I hear the connect sound but nothing shows up on the taskbar that a new device has been found. When I tried to burn files to a CDR it was still trying to do this on the old integral burner so it's not identifying the new external. Can anyone help? Do I need to do something to enable the laptop to identify? Thanks.