I cannot get a signal from my MacBook Pro to a Samsung T220HD using an HDMI cable

I was in the Apple store to see how to improve the resolution on my Samsung T220HD, which I had connected to my MacBook Pro using the PC cable and an Mini DisplayPort adaptor.  The staff recommended I buy a Kanex Mini DisplayPort to HDMI Cable instead.  I've plugged the new cable in, and the Samsung display reads "Check signal cable".
I don't have another cable to test it; am I doing something wrong?

Mini Dis[playPort cables have a lot of contacts, and require a lot of force to seat properly. Push until all the metal part of the plug disappears into the jack.

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