Connecting laptop to hd tv w/ hdmi

I have successfully hooked up my Gateway laptop to an RCA HD TV & an Insignia HD TV, but I can not get my 42" Westinghouse 1080p HD TV to work w/ laptop. I am using HDMI connection. I did get it to work for a few seconds, but never again. When I plug HDMI cord into other tvs I get a sound on the computer. No sound w/ Westinghouse TV. Any ideas?
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More about connecting laptop hdmi
  1. Maybe the laptop doesn't recognize the TV. Try the FN and F5 key or whatever key your laptop has for switching to the TV as the primary display.
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