IMac partition screwy

Hi all,
I have a 2010 iMac, I recently discovered a friend was using it and forcing it off with the power button, not shutting it down. Unsurprisingly something went wrong and now on boot it just shows a folder with a question mark.
Recovery mode works fine (this is a partition on that same physical disk, right?) but can only see "disk1: OS X Base System" of 1.27GB.
There is, however, above the line, a drive called MEDIA of 0 bytes. I can't erase or partition this.
Any suggestions?
PS If it matters it is (was? ) running 10.9.4

Hello Peteindigital,
Thanks for using Apple Support Communities.
Please follow the steps in the article below, in order, to troubleshoot this issue where your Mac will not boot past the flashing folder icon.
Mac OS X: Gray screen appears during startup
Take care,
Alex H.

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