Macbook Pro only starts with back cover open

My macbook was not detecting it's internal hard drive and therefore wouldnt boot any OS. I carry my macbook with me often when im on my bicycle so I thought maybe an internal connection was loose.. so I opened it up and made sure everything was snug. I turned it on to make sure it worked and everything was fine -- --- until I screwed the back cover back in. It shows the same error now ( cant find my hard drive ). Why is this happening?? Would very much like to use my macbook without all its internals showing. If anyone could help me with this it would be really appreciated.
--EDIT--
I loaded disk utility from the internet recovery option (which was my only option) and disk utility could not find anything besides the image that it was running on.

I would look very carefully to see if there is anything that seems to be 'hanging' when you orient the MBP in the correct direction. Perhaps electrical tape in the right locations may be a temporary fix. A genius bar visit is still the best option.
Ciao.

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<Email Edited by Host>

Hi ...
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Try resetting your admin password > Mac OS X: Changing or resetting an account password

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Macbook Pro only starts with back cover open

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