I hope you can help me with my Lite On 1633SX. I bought the drive about 4 months ago and it worked perfectly until 2 weeks ago. I tried to listen to a music cd and the drive did not recognize the cd. I went to Nero and when I tried to burn mp3 files it ejected the blank cd. It reads dvds but I don't understand why it does not read regular music cd's. Does anyone know what I need to do? How can I fix this? Thanks!