I am having trouble getting thunderbolt to work between my macbook pro and imac

I am trying ot set up thunderbolt on my labtop and desktop.  I plugged both into the thunderbolt as well as a power sorce but neither seem to recognise the Thunderbolt.  I looked up a totorial that said I should go to system preferences and displays and change the Arragement but my display only has display and color.  I've updated both and have OS X Lion 10.7.5 on both.  I feel like it's got to be something simple I'm over looking. 

Awesome, thanks everyone for your brilliant ideas in regards to trouble shooting this issue.

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