811s problem

I have searched this and many other forums and cant find anyone else with the same problem. I have a 811s with newest firmware and it will not read cds. It will play dvd’s perfectly. When I insert a cd it does nothing. The light comes on for a few seconds and that is it. I can burn a dvd but not a cd …
My other drive works fine (plextor24/10/40a) on the same cable. I have switched them back and forth from master to slave and stand alone.
I have just replaced my mobo from a gigabyte 8ik1100 to a Abit ic7-max3 and still have problems.I also changed the cable .

any advice before I contact Lite-On ??