I have 3 identical LG GH22NS50 DVD drives, however one of them does not function. It does not read CD's or DVDs. The drive is displayed in computer, but when I put a disc in it simply doesn't read it. If I try to run the disc by double clicking the icon, it comes up "E:\ Application not found", and if I try to explore it comes up a message saying no disc inserted, and ejects the tray. I have tried all sorts of media, several games, several CDs, several movies, and none of them work. I am able to play the same discs in my other 2 identical drives, so it is definitely a problem with that individual drive. I switched the sata cables around between the drives, and it is still the same drive which isn't working. All DVD drives are set to the same DVD region (Region 4 for Australia). I've (in no particular order) deleted the upper and lower filters in the registry, uninstalled the drivers, updated the firmware for the drives, reinstalled the original drivers that came with it, updated the drivers, uninstalled & reinstalled all DVD burning/ripping software, including Nero, AnyDVD, iTunes, etc, but none of it is having any effect. How do I fix this problem? Edit: The drive did work originally, it's only been recently that it has stopped working.