Projector not recognized in El Capitan

My projector is not recognized by El Capitan.  I have tried on 3 laptops running El Capitan and it either blocks the laptop, or it does not recognize it.  I tried to reset the SMC, and I tried now the Option key pressed to get the option detect screens in the settings.  I finally plugged the projector to an MBA Yosemite running and it works fine.  Any ideas?

I can not yet use a projector with El Capitan.  I have reset the SMC, and who did nothing.  I tried 3 cables all work with Yosemite.  Nothing.  That is what it is?

Tags: Mac OS & System Software

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