Computer won't boot from any disk, including recovery.

When I try to boot from the main drive, I get this http://i.imgur.com/9Adq5NI.jpg screen.
When I boot from recovery I get the apple logo and it shuts off.
So I have an Ubuntu district I'm using,
How do I fix this?

Well let's start from the beginning. I was being an idiot and messing around with unix commands and created a directory in \usr\, and went to command line delete it with rm -rf \usr\ DO NOT DO THIS!!! I canceled it before it could do damage to personnel files etc. but it destroyed the OS. So with your advice I created a small partition of the disk and copied over personnel files.

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