Macbook Pro to Toshiba LCD via HDMI screen shuts off

I have a mid 2010 model Macbook pro hooked up to a 46'' Toshiba LCD tv using the moshi connector and an HDMI cable. Every 25-30 minutes the screen goes black for 2-3 seconds as well the sound turns off. The picture then comes back, usually to shut off again for 2-3 seconds then will remain on for another 25-30 minutes. This happens each time I connect the laptop to the computer.
I have returned the TV, connector, and HDMI cables and the issue has continue to happen. This leaves me thinking that it must be an issue with the computer. Does any one have any tips or ideas as to what I can do to stop this? Its really irritating to try and watch a movie to have the picture cut out periodically.
Thanks

Hi, Guys
I'm using a MacBook Pro with a Samsung 610 52" color monitor for studio video production.
I'm using an adapter to hook up the TV to the Mac via VGA. There are times when I can get the image on the screen, but any time I either start cold or have to change a cable, I get the message "check signal cable." I originally thought the problem was the cable, but changing out three different "known to be good" cables did not resolve. When select system preferences=>displays=>gather windows, the Samsung window with resolution options opens. Nothing as of yet immediately resolves the problem, but if I **** around with it long enough (plug and unplug cables, turn both computer or LCD off and on), eventually I get a picture. And yes, I never had this problem when we were using a Dell Inspiron. Any suggestions or resolutions, please let me know.

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Based on your post it seems you are unable to get video on an external display. The following article may help you find a solution:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
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If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.
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Macbook Pro to Toshiba LCD via HDMI screen shuts off

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