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Apparently older Macs don't support audio through HDMI. Audio needs to be transmitted separately through the jack connection on your Mac, just as if attaching speakers. Then depending on your TV could be jack or RCA.


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May I suggest that you not look for a cable with a "female" HDMI end on it (those would typically be called "adapters" and would be very short. Instead, look for a full-length cable with mini-DisplayPort to HDMI. Such as: http://www.monoprice.com/Category?c_id=102&cp_id=10246&cs_id=1024603


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In the settings screen within the "General" tab is an "Lock/Unlock" Boolean that controls whether the device sleeps when the screen cover is closed. Turning this off will maintain the screen contents when the iPad is locked or smart cover closed, but it means the device screen is on until the auto sleep timer triggers.


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Reboot the Mac with the monitor cable connected. That sometimes fixes it.


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According to Rhys Oxenhams: the kernel will keep looping some very simple tasks, e.g. getting the date, therefore ‘consuming’ (with the highest priority) the majority of the CPU in a bid to cool the system down. The solution he mentions on his blog should work for earlier Macs. For Ivy-Bridge Macs and a little earlier Richard Schwarting has found ...


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I haven't had any issues using third party adapters but it looks like your adapter isn't compatible. You can buy the official apple one on apples website.


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HDMI connection lost Could mean that the HDMI cable is not having good contacts on the pins. The only way to test that is to get different HDMI cable. Apple also provides some instruction on how to fix it.


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After some digging, I finally found a solution : Update to Yosemite. Apply a patch to IOKit.framework : https://github.com/Floris497/mac-pixel-clock-patch Enjoy 2560x1080 50Hz using HDMI cable



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