My hard drive wasn't starting up, tried to repair it, that didn't work so I deleted everything off the drive. How do I get my Mac to work normally again?

Someone help me get my Mac working back properly. I erased everything off my drive due to it crashing, now my Mac reads my drive but it won't boot up properly. How can I fix this?

If you deleted everything as in repartitioned the drive, therfore it has no Operating System.
Did you repair the drive?
use Recovery  to repair and re install the OS.
http://support.apple.com/kb/ht4718

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