where'd you get the lappy from? Sounds like something is stuck in there, and I'd just take it back to where I got it from and have them fix it. If you bought it from a second party dealer, the replacements aren't that expensive depending on the type. Who knows, you may even end up with a dvd burner.
But it sounds like something on the interior is catching on it the chassis. Just out of curiousity, have you tried the bent paper clip with the cd rom removed from the laptop?
thanks,
v