New iMac as second display for MacBook Pro not working

I just bought the new thin 2012 27" iMac as a replacement to the last model I had.
I want to use the iMac as a second display for my 2012 MacBook Pro.
I have a Mini Display Port to Mini Display Port cable that used to work with my previous setup and at work with my external display.
However, this isn't working on the new iMac. When I try the Command + F2 suggestion I've seen in the forums here. Nothing happens.
Do I need a new cable now that these are "thunderbolt" connections?
Any help is greatly appreciated.
Thanks.
Demetre

You will most likely need a Thunderbolt cable as they are both Thunderbolt devices and not Mini DisplayPort.

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