Whilst I've never had my 360 scratch a disc, it does suffer from the sticking tray that won't open.
Leaving a disc in seems to solve the problem as it only occurs (in my instance anyway) when there is no disc in the drive. My 360 is vertical. I've read that having it horizontal may also solve this problem in some cases.
If you want to get the tray open you can always force it open by taking off the face plate and trying the straightened paperclip method outlined here:
http://answers.yahoo.com/question/in...AAMDQ00&show=7
It will also open sometimes if you try to push the tray front in just as it tries to eject.
That might help just so you can get a disc in to see if it works fine everywhere else.
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