Explain in more detail, you need an XBOX compatible dvd for it to work, different drives read different media. There are four drives ever made so far. Philips, Thomson, Samsung, Hitachi, none is better than the other, you just need to find out what media yours reads.
Here's a diagram I made to find out what drive you have.
Then search for media compatibility on this site.
If this helps please click the FAR left icon at the left of my post to add to my rep. The one on the left, not the right. Thanks.