Well I can explain why your drive closes automatically while booting. The same thing happens with my computer. If you have the door open, it will close when you boot the computer. As far the opening is concerned, it may be because of a virus that is messing with your computer. I'm not sure, but this might just be the answer to your problem. Run a virus scan and quarantine/delete any viruses you find and report back to us if the problem persists.
-Dan The Man
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