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

i think its a problem with resolution on the Tv is there a way to restore it or does anyone have a solution?

anything is helpful thanks in advance.. Robin