Macbook pro hdmi problem

Hello guys and girls
I have a problem, when i connect my macbook pro to my sony TV its shows video and sounds as it should. but when i close the lid on the mac it dissapears and goes into blackscreen as  nothing is connected, and no matter what i do i cant get video back. but when i connect to a new TV i get the video and audio..
when i go from HDMI 1 where its connected to HDMI 2 and back to HDMI1 its shows shortly blue screen as it always does when its get connected but its still shows no video output
anything is helpful thanks in advance.. Robin

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