HDMI from Macbook to Samsung LCD

Hi
Bought an iWires Mini DisplayPort to HDMI cable to today with the view of connecting my MacBook to my TV, all is well apart from on my TV it flickers and cuts out and I get a black screen every few seconds.
What is causing this and how do I fix it? Any help much appreciated.
Thanks
Chris

But if that is the case, how come my TV works perfectly fine in full screen mode when I watch a DVD from the Macbook? Netflix used to work perfectly as well and I don't think I changed any settings in the last two weeks...

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