Cannot Connect iMac Monitors Together?

I am trying to connect a 2nd iMac so I can use the screen for viewing another open application.
I bought a 2m Apple Thunderbolt Cable and connected them - but I can't get the dual sharing to work.
My main iMac is 21.5 Late 2012 running Mavericks with Thunderbolt port
My 2nd iMac is 21.5 Late 2009 running Mavericks with MiniDisplay port
Any suggestions on how to fix?

Video – Target Display Mode - Use another Mac as a Display - Mavericks
Video - Target Display Mode: FAQs

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Please click “Accept as Solution " if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks" for helping!
Jamieson
I work on behalf of HP
"Remember, I'm pulling for you, we're all in this together!" - Red Green.

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Cannot Connect iMac Monitors Together?

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