My imac late 2012 says No boot device available ...
I made a Bootcamp partition to restart the computer but I can not put OS X's system, try CMD + R, C, D, and Alt + ALT + R + cmd.
iMac, OS X Mavericks (10.9.1)
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Power off your computer. Power up the computer while pressing and holding the option key. When the boot manager appears select OSX to boot.