Toshiba regza 55 hdmi not working

when i turn my computer on and put my tv to hdmi 1 all i have is a blue screen everything was working fine the night before. i tried hooking up the computer to a old monitor i have and it works fine. is the problem with my hdmi ports and how do i fix it.
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  1. Hi

    From looking at the specs of the T.V I can see it has 4 HDMI ports have you tried all of them?
  2. yes i have and alsotried new hdmi cables and still it doesnt work
  3. took the tv in and it was the main board that was gone not cheap
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