Well for one, he didn't pull anything out of the hard drive
And you should be able to work it back in. It can be tricky, and sometimes impossible. You tray just isn't getting hitched to the tracks like it should. You have to work with it and try and get it to rest on it's tracks so it can be pulled and pushed.
You shouldn't have to push it in, you'll know it's working by setting it in there and using the eject button to pull it in.
Hope that helps.