There is nothing blocking it from opening I took the white case off and took the disc drive out and took the too off to see if there was anything out of place but didn't see anything. Now the disc drive is back in place and been playing my xbox with the white case off and now the disc drive randomly does the opening and closing thing and been making some more noise when it try's to read the disc but still reads it and I know know if that's bad or what
there is probably dust or dirt on your laser reader. i had the same problem it wont read the games, there is a disc for about $15 about that cleans it just put it in and do what it tells you. if it doesn't read that disc just hit that top of the xbox when it is reading it.