ASUS DVD-R/RW-- DVD's: "no disk" CD's: work fine

This is a doozy. I don't know if anyone can even tell me what truly
happened or not. Here is my story:
I recently got a DVD/CD drive that worked perfectly fine... for a
while. I used it for some time and then one night we rented a movie
(Finding Neverland) and watched it on our TV's DVD player. After
watching it my sister came home and wanted to see it so my mom stuck
it in again, but this time it didn't work. The player said that there
was not even a DVD in the player. I decided then to take the DVD and
let her see it on my computer (trying to be nice) and when I stuck the
DVD in my drive, it too said no disk was in it. From that night on
both the player and my drive didn't work. I could and can play CD's in
it just fine, but no DVD works. The strangest and most anoying part of
it all is that the other day the TV's DVD player just started working
again out of the blue. Anyway, I don't expect anyone to be able to
solve this problem, but if you have any ideas you should write me!
My drive is a ASUS DVD-R/RW and the TV player is a Samsung DVD VCR
combo. I am stumped.