Using 2009 iMac as second display for 2012 iMac

I am using my 2009 iMac as a second display using a mini display plugged into the 2012 iMac Thunderbolt port.  When I plug it in, it works fine, but if I need to restart my 2012 iMac, it won't recognize the second display on reboot.
How do I make my 2012 iMac automatically recognize the second display?  The only way I seem to make it work is by unplugging the cable, and then plugging it back in.  When I do, it immediately recognizes the second display.

Thank you. Here's where my confusion comes in
"iMac (Mid 2011) and later: target Display Mode does not work with Mini DisplayPort cable"
Symptoms
When you attempt to connect an iMac (21.5-inch or 27-inch, Mid 2011) and later to another computer with a Mini DisplayPort to Mini DisplayPort cable, the screen of the target iMac will not become an external display when you press Command-F2 to activate Target Display Mode.
Resolution
iMac (21.5-inch, Mid 2011) and iMac (27-inch, Mid 2011) and later computers support Target Display Mode via Thunderbolt to Thunderbolt cable (2 m) when the source is another Thunderbolt-equipped computer.
iMac (27-inch, Mid 2011) computers do not support Target Display Mode via Mini DisplayPort cables.

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