I have two disc drives--one that reads cds & dvds and one that reads and also burns them. Neither of these will recognize that a disc is even in there--when I try to play the disc or open the file it says "please insert a disc." The dvd burner drive does show how much disc space is available if there is a disc in, and when I try to open it, the menu that should show the disc contents is empty. This happened after we took our computer on a long trip to have a different issue addressed--could something have been jostled loose? Or is it more complicated than that? Any ideas?
