I can't get DVDs to play on laptop..

[Jesus Shuttlesworth]

I put the DVD in and the computer attempts to read the disc, but then it just stops and it doesn't recongize that there is a disc even in the D drive. Any ideas? Pretty sure this happened a few times but I'm not totally sure - don't have any other DVDs laying around so I can't test them but like I said I am pretty sure I remember this happening before.

Any ideas?