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You have to unplug it and replug it. May take more than a few attempts but give it 5 seconds or so before trying again. Problem still happens even on later models.


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If all you want is to have your desktop confined to your computer's screen, go to System Preferences > Displays > Arrangement, and check Mirror Displays. That'll make it so that your HDMI display only acts as a mirror of the desktop you already have, rather than an extension of it.


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There is no way to transmit only audio data via HDMI. The HDMI white paper (page 10) notes that the signal is sent in HDMI packets consisting of both audio and video. Despite all the pins, there are no separate audio and video signals, so there are also no HDMI A/V splitter cables. The only way to get around this is to send blank video data (e.g. a black ...


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A solution using the free version of Sound Siphon To solve both of these issues: Launch the Sound Siphon app. In Sound Siphon’s preferences select your output device as the pass through device. Turn Sound Siphon on. Sound Siphon processes the audio before it goes to your output device. Now you can use your keyboard to control the volume" ...


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ref: EveryMac *Although Apple only reports that this model can support a single external display up to 2560x1600, Intel reports that this model can simultaneously support two external displays up to 2560x1600 "daisy chained" via Thunderbolt. From Belkin's page on the Thunderbolt™ 2 Express Dock HD … "Note about dual displays: At least one display has ...


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You can only connect two or more displays to your mac when it is a thunderbolt display. When you have an thunderbolt display and a non-thunderbolt display, your mac will automatically start working with the thunderbolt display until you unplug it.


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Mini DisplayPort and Thunderbolt are essentially the same connection, just with different hardware controlling them. Thunderbolt is essentially a combination of Mini DisplayPort and PCIe. I assume this was done for backwards compatibility with older hardware that was Mini DP (so you could use an Apple Cinema Display on a newer model MacBook Pro, for ...


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This model supports a simultaneous maximum resolution up to 2560x1600 on two external displays via Thunderbolt. Alternately, it can support a single display up to 2560x1600 via Thunderbolt and a single 1080p display at up to 60 Hz, 3840x2160 at 30 Hz, or 4096x2160 at 24 Hz via HDMI.


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First (with HDMI connected, in multi-display environment): Open System Preferences > Mission Control > uncheck “Open Displays as separate spaces.” Log out and log back in. Any luck? If not... Second: Start up in Safe Mode. Among other things, this purges certain system caches, which may be corrupted, and subsequently rebuilds them. Shut down your ...


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Some monitors don't have speakers, when plugging into the two I have, there is no option to send audio through to the monitor; on other television monitors the option is there. The OS X sees the monitor and calls it by name, so there must be something in the return signal sent from the monitor that "tells" the OS if it is capable of audio.


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Unfortunately, adapters like that don't exist, AFAIK. That is, you can't just convert from HDMI to DisplayPort via a simple cable. The [Mini] DisplayPort to HDMI adapters aren't just cables, they contain IC's that provide an HDMI interface. I don't know of any such adapter that works in the other direction.


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I was able to get the external monitor to display when I used an HDMI to DVI cable. HDMI output from MacBook, DVI input on the LG monitor. I have and LG 27 inch monitor



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