Installing OS X on Mac without no current operating system?.

I recently received a 27" iMac, however the hard drive was completely wiped before I got it. When I turn it on, all I see is a flashing grey folder with a question mark. Based on research, I guess I need to install a operating system on this iMac. How do I go about this? I'm having trouble understanding how to get an OS and install it. I also cannot find a serial number underneath the computer and cannot access it on the computer since it will not start up
The earliest 27" iMacs created began in 2009, so i'm assuming its from around then if that helps
Any help is greatly appreciated!

You may have to contact Apple (main support or applecare) to see if there was any software on DVD media for that model, if there is no optical drive slot, then it likely shipped with Lion 10.7 installed, but may have had backup media discs. Those would be available by serial number and product model number descriptions; so if you do call or contact Apple, have those indentifiers handy. These may be on the foot of the iMac, bottom of the stand.
Also, it may not be legit. Find serial numbers - other than logic board:
http://support.apple.com/kb/HT1750?viewlocale=en_US&locale=en_US
The hard disk drive may be accessed by another Mac, if the computer has a Thunderbolt port and if you have a Thunderbolt to FireWire cable (or thunderbolt-thunderbolt?) so as to use another Mac to go into the iMac and check the HDD formatting, etc. Target Disk Mode. And perhaps be able to go to the Mac Apps Store to get a suitable OS X download. Usually those require a base system, so that is a hitch, so whatever the computer had on the hard disk drive in Recovery partition (if totally erased) would be needed. Online Recovery may work.
Since my antiques do not use Recovery, you may have to read up on that option.
Good luck & happy computing!

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