27" iMac (refurb, June 2011) not working as an external display for my MacBook Pro.

I just got a 27" iMac (refurb, June 2011) and it's not working as an external display for my MacBook Pro (not Thunderbolt).  Any idea why?  Command+F2 does nothing.  I am connecting via Belkin Minidisplay Port-to-Minidisplay Port adapter.
Any help is appreciated...thanks!

Currently the ThunderBolt iMacs can only be used as an external display by other ThunderBolt Macs.
http://docs.info.apple.com/article.html?path=Thunderbolt/10.6/en/30822.html
Apple is very clear about that.
2009 and 2010 27" iMac with a Mini DisplayPort can be used by other Macs with a MDP-to-MDP cable.
Stefan

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