JLMS XJ-HD166S does not read my DVDs!!

I'm not sure why, but I always watch movies on my computer. But I think things changed when I tried to play Iron Maiden's Death on the Road DVD, and it wouldn't work. Later on the week, I tried to play an ordinary DVD movie, and it did not work, my DVD drive did not read the DVD at all, it wasn't picking up anything? What's wrong here?

yea i have the exact same burner from lite-on. I dont know what's going on. i dont like watching dvd's on my dvd-rw but for the last week i can't get any dvd to work on my JLMS XJ-HD166S. I'm thinking of reinstalling the firmware or something. Unless anyone has any ideas to what the problem is. It's weird it just started happening last week.