I have a new Dimension E520 and I have a problem with my combo drive. When I first got the computer about 3 weeks ago it wouldn't read a dvd or cd but i changed the digital setting and it worked fine. Now it will play a DVD perfect but won't read, play any other type of disk. I have tried everything known to man and still it won't read a CD. Any info will be greatly appreciated.  

The drive is a TSSTcorp CDRWDVD TS-H493A

 

Thanks Alot