How to connect ast180 to tv

I connected my Acer Aspire180 to a Sonny Bravia HDTV and on the tv screen I see "unsupported signal"
I rebutted my computer and it worked but only once and now I'm getting the same unsupported signal message. What di I have to do to fix the problem
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More about connect ast180
  1. Are you using the integrated nVidia MCP61 graphics controller or a discrete graphics card?

    The appropriate graphics card device driver needs to be installed and configured to output the appropriate resolution and scan/refresh rate that your Sony HDTV accepts.
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