if one TV works I doubt Serato or your Mac is the problem, might be an issue with the hardware the venue has.

Did someone mess with the HDMI Matrix system or the cables?

I dj at a spot with many screens too and often times I will plug into the HDMI cable that runs into the matrix system and a few screens won't switch to my videos.

On further questioning I would learn that some techie was working on the system during the week and he would have changed some cables or something else.

Used to be super annoyed but I've learnt not to fret often times I end up just doing audio. It's not my problem.

Thanks so much for the reply Marv.

Hmmm, have to check that out. When the TVs are on displaying regular TV they all work. But when hook up laptop and run video, i only get 1/3 of the screens.
Going to go back this week and hook up another laptop that has Captain and see what happens.

Will keep you posted. Thanks again.

Yeah they might have changed some of the connections to another box or something. Places where they show sports do this as they might have multiple switches so they can show two or more channels on different screens.

If there is only one sports program on they just put all the satellite receivers on the same channels.

Grab "display app" from the App Store

It allows you to quickly jump around resolutions on your second screen.

If your coming in hot, or too cold that could be the cause. (The OS might have switched to a different default resolution/refresh rate)

It's worth upgrading for the $1.99

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