I had the same drive, it stopped reading dvds also. took a few hours chatting with dell, they did send me a replacement drive. you should be able to get a new drive if its still under warrenty.
I received windows 2005 mce cd, driver and apps cd and media direct cd when i asked chatted when them.
When my dvd-rom went out I ask why my HD was running hot at 55deg c and he sent me a new hd with not questions. I was sent the cd to...