IMac TDM not working

Hi
Iv just got my new iMac 2013 27"
iv also got a iMac 2011 27"
i whant to use the new as a display for the old or the old as a disply for the new.
i know about the CMD+F2 (FN+CMD+F2) but it wont work.
what am i doing wrong , im using a mini-display cable (not from apple)
/Thomas

Then you do not have what Apple calls an "iMac (27-inch, Mid 2011)" model. To confirm this, open System Profiler (or System Information if you are running a recent version of OS X) from the Apple menu. In the Hardware Overview section, you should see a line that says "Model Identifier."
If it is a 2011 27" model the IDD should be iMac12,2 (which has Thunderbolt). If it is the 2010 model (which does not have Thunderbolt) it will say iMac11,3.

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