I have a CD/DVD combo that I use to burn CD's etc...Recently the burner has just stopped burning no matter whether I choose to burn a music cd or data cd. Im using NERO Express which I have uninstalled a few time but the results are the same. When I click on the burn button, the cd draw opens and asks for a blank cd even if there is a blank cd in the drive. The drive can play CD's and DVD's though. Any advice is greatly appreciated.