My LiteON SHW-1635S was working fine with CD-R, CD-RW and CD-ROM until yesterday when it started rejecting CD's. I tried different brands of CD-R, CD-RW and CDROM. Most of the CD Media Brand were LiteON recommended I read from its manual. When you insert CD the drive doesnt accept the media, it makes a sound for a while then it stops. then nothing happens. I tried DVD's and it works fine. It reads DVD's and burn them. Im using the latest firmware YS0W. Please help me on any sugestion on what to do.