HELP!! I have the liteon it ltd 163. I have been happy with its performance... until yesterday. I put a cd in the drive, and it will not read it. It has worked fine up until now, and currently the computer (device manager) still detects the drive, but I get the "please insert a disk in drive "(drive letter)" I have NO idea what to do, or why it doesn't work... I would appreciate ANY help I can get... PLEASE.