Thunderbolt to hdmi: mac detects the tv but the tv get no signal

Hey,
I have Macbook pro 15 with Lion 10.7.4 on it.
Lately i'm having problems to connect my computer to the TV,
I have connected it with the Thunderbolt to HDMI connector, It used to work.
Now i can see the TV on the System Preferences -> Displays, so it detects the TV, but there is no output, it shows nothing,
The Tv shows that there is no signal...
Many thanks for your help
Eliran.

I don't have a Sony, so I don't know exactly where the setting is hidden in your case. What you want to do is let the Sony know that the HDMI input is connected to a computer, not a BlueRay or cable box or DVR. This should fix it. My TV allows you to select a name for each HDMI input. Once you select "PC", the HDMI input behaves in a slightly different way.
Could be a HDCP handshake problem, who knows....

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Thunderbolt to hdmi: mac detects the tv but the tv get no signal

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