My ordi do not send signal through my Hdmi to tv

I used to have an excellent connexion between my ordi and my tv through my HDMI and suddenly my Tv do not receive the signal anymore?
I was wondering if there is something to do with Mavrick? or other suggestion?
Thank you

when I'm too use my appletv I use my tv's remote to choose the input source
in my case the hdmi 2 port
it of cause can't automatic switch because my sat box and ps2 are also sending signals too it so it don't know that I want it to show the appletv rather then any of the other connected boxes

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