Lite-on Dvd Burner Problem

I have a lite-on dvdrw sohw-1693s it will copy and play any dvd that i put in it, my problem is if i put a ordinary cd either music or data it will not pick up the disk it say the drive is empty. any ideas as to what is wrong. :a

Probably the cd laser is dead!!!
Here is the best way to check: get a bootable CD (your windows Xp cd for example) and try to boot on it!!! (make sure you have set your computer Bios to boot on the CD first)
If it still doesn’t see your cd it means the laser doesnot work!!!
Be aware that in ad dvd burner, you have two lasers: one for CDs, the other for DVDs. One of them can die while the other keeps working!!!