HDMI (High-Definition Multimedia Interface) is a widely used interface for transmitting audio and video signals between devices and displays.

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HDMI & VGA issues with MacBook Pro Retina & Acer Monitor

I'm having a very strange issue. I inherited an Acer monitor from a friend that is full HD, 1080p. Good monitor overall. When connecting ONLY an HDMI cable from my Mac to the monitor, I get no signal. ...
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446 views

My monitor doesn't sleep if my mac is connected via HDMI: who's at fault?

I have a MacBook5,1 running 10.8, and an Asus VW246 monitor. I connected it to the monitor using a "MiniDisplayPort->DVI(f) adapter" + a "DVI(m)-DVI(m) cable". Now I've bought a single "...
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68 views

Would using thunderbolt-to-hdmi help?

Late 2013 Macbook Pro 15.4" 2.6Ghz I connect HDMI and not always do the full spectrum of resolutions appear within the list of choices? System Preferences (app) -> Displays (preference icon) ->...
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106 views

iMac and HDMI display - not turning off properly

I'm using iMac on my work and when i said to my boss that i need 2nd display for work he ordered it and it arrived. Philips Gioco 27" But that display has only VGA and HDMI ports, no DVI. So we bought ...
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23 views

Why does my Apple TV 4 often turn my receiver off on startup?

I have an Apple TV connected via HDMI to a Pioneer VSX-S510 which in turn is connected to my Sony Bravia KDL-32W4000 TV. I have everything set to power on automatically, and I can control the ...
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48 views

HDMI not working anymore on MacBook Pro

HDMI has been working fine for as long as I remember. However, today when trying to connect it to my Sony TV, the HDMI wasn't working. It's not the cable or TV (tested different laptops/cables) so it ...
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76 views

How do I record HDMI input to a file with my Mac

So I have an HDMI signal and an HDMI to USB adapter. I need to record this HDMI signal to a video file. Zero budget. Will plugging this into my Mac work as a video input? If not, how else do I do this?...
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116 views

My iMac detects a samsung external monitor, but nothing comes up on the display

I've got a late 2013 iMac running OS X El Capitan and am trying to get a second screen for work. Its a Samsung LED Syncmaster SA350 Series (Plug & Play). When I plug it in, nothing but a black ...
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138 views

Switching HDMI input to Apple TV causes crackling noise and strange video

When I switch HDMI inputs on my TV from Tivo or Blu-ray to a sleeping Apple TV (4th generation, with apps), I get nasty crackling electronic interference noise on the sound system plus weird LSD-acid-...
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45 views

How do I get all three monitors to work with 2015 Mac mini?

I have a 2015 Mac mini with two monitors hooked up out TB-VGA adapters. A HP and a Compaq. Today I added (or tried to add) a samsung 24" with the HDMI. Since adding the samsung, I can only get my ...
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129 views

How can a Mac mini drive 3440 pixels wide display instead of 1920?

I've bought a new 21:9 IPS screen with a native resolution of 3440x1440px. The display has only two inputs: 1x DisplayPort which is connected to a workstation and 1x HDMI port which should go to my ...
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42 views

MacBook Retina 15" HDMI glitches

I have a 15" Retina MacBook (mid-2012), and I encounter issues with HDMI external displays. Sometimes, the connected display will turn either totally black or with white noise for a few seconds, and ...
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272 views

Change refresh rate/resolution on Seiki 4k using Mac Pro via HDMI?

I have a late 2014 (current model) Mac Pro and I use a Seiki 50 inch 4k TV to for that computer (the seiki does 30hz at 4k and should do 120 at 1080p). I use the HDMI port on the Mac Pro to directly ...
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274 views

Dual-Monitor: Second monitor black after sleep mode

I'm using two Elgato Thunderbolt Docks on my MacBook Pro Mid-2012. I connected two displays to them: One HDMI display on each of them. Both are LG-Displays, one a 16:9 and one a 21:9 display. This ...
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75 views

Dual monitor support from the HDMI port on a 2012 Mac Mini

Will the HDMI port on a late 2012 Mac Mini support dual monitors (landscape) when run to an HDMI matrix distributor for connection?
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295 views

Force 2560x1600 through HDMI on a Mid 2011 Mac Mini?

So I want to run dual 30" monitors on my mid 2011 mac mini. I have two U3014 monitors. While one works fine through mini display port, the other one is forced to run at 1080p via HDMI. Is there anyway ...
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173 views

Why is my MacBook Pro Hanging when using two VGA monitors, one connected to HDMI and the other to a USB port?

I have a MacBook Pro that started to hang recently. I'm looking for insights on the cause and potential fixes. The Apple Genius Bar folks did not find anything. It is configured as follows: Processor:...
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101 views

How to change audio output according to display state?

I've got a Mac Mini connected to a TV via HDMI. I would like to have the audio output device changed automatically to external speakers if the TV is turned off. I can imagine that this feature is not ...
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238 views

Black borders with external monitor on MBA 2013

I have a problem that I'm not able to fix. I'm getting black borders, some king of margin. The display doesn't use the full space in the monitor. I have a total of four monitors in my house and three ...
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251 views

My mac mini HDMI display switch off and on

I have a mac mini (mi-2011) connected to a screen using an HDMI cable. I have nothing on the screen except several second from time to time. I tried to autodetect the monitor in the system ...
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595 views

Retina Macbook Pro with External Display (Samsung BX2440)

I have just switched to a rMBP from a Windows 7 laptop. I use an external 24 inch monitor (Samsung BX2440) via the HDMI port on the rMBP. It seems that due to some scaling, the text on the external ...
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348 views

How to debug external display connectivity problems?

I'm having problems with connecting my retina MBP with external displays of all kinds. The DisplayPort->VGA adapter has a 1/4 success rate. The HDMI port (via a DVI adapter) does not see my monitor. ...
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934 views

iMac - 2nd display not working using thunderbolt - HDMI

I recently bought an LG monitor to use as a 2nd display but my iMac (mid 2011, running Mac OS X Lion) doesn't detect it. It's connected using a Thunderbolt-to-HDMI-cable (which I bought from The ...
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710 views

MacBook Pro HDMI No Sound

I purchased a MacBook Pro in March of 2011. I plugged a mini-to-HDMI cable from my laptop into my Sony receiver. I have no a picture, but no sound. There is no external source listed in the sound ...
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245 views

Any way to compare Thunderbolt config in picky iMac 21.5“ and happy MacBook Air 11”

Having tried to debug a really annoying 21.5" iMac for a day now, I'd appreciate any hints. The scenario goes like this: We got an iMac 21.5"(Mid-2011) for an auditorium and plugged it in through an ...
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15 views

How to render external display in native resolution?

I've a UHD display connected to MAC via HDMI. But the external display is not rendering in native resolution. There does not appear to be an option in preferences to set to native resolution of ...
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29 views

Early 2015 Retina Macbook Pro not recognizing/working with some external displays

I have an Early 2015 Retina Macbook Pro 2.7 GHz i5, and it does not work with certain displays. I first tested it with a display(call it display A) Mini Display Port to DVI cable which did not work. ...
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17 views

HDMI flickering upon ac connection

I have purchased an mbp 13" early 2015 2 weeks ago. Everything seems to be ok but 1 issue: hdmi is behaving very weird. Got 2 external monitors, one connected using a dvi-to-hdmi cable, the other ...
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25 views

4K Scaling Issues on Display Port but HDMI Working Fine?

I have a 2012 Macbook Pro Retina with an external Samsung 4K monitor. When I hook the monitor up via Display Port to Thunderbolt I get a few resolution options. However no matter which one I pick its ...
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62 views

Plugging in an external HDMI display makes the computer sluggish

2015 2.7 GHz Intel Core i5, 8gb ram MBP and it usually feels snappy but when I plug in my external Samsung HDMI display it slows down considerably. Animations are janky, delays in editing text, and ...
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33 views

How to reach full resolution potential with MacBook Pro 2012?

I have a MacBook Pro (13-inch, Mid 2012) running OS X El Capitan version 10.11.4. I am attempting to use an external display with my Dell U2715Q (has 4k capabilities). I purchased an AmazonBasics ...
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38 views

Macbook air 2015 + elgato thunderbolt 2 doc to use two external displays

I have a 2015 Macbook Air running Yosemite v10.10.5. I recently purchased a Elgato thunderbolt 2 dock and would like to connect two external monitors. One using thunderbolt-to-DVI and the other using ...
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30 views

Mac mini 2014? Connecting to a 2nd monitor

I currently have a mac mini with a thunderbolt connecting my vga monitor to this. I now want to connect a second monitor but my problem is this....I only have a hdmi female in the mac mini and the ...
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19 views

How to display non-DV video signal with Firewire input?

Is there any way to get the video signal output from a Displayport (mDP) or Thunderbolt (1 / 2) socket into a Firewire (FW800, IEEE 1394) input? What cables, adapters and drivers or other software ...
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63 views

External monitor cuts out on MacBook with Multiport Adapter

I have a newer MacBook with only a USB-C port. I use an Apple USB-C Digital AV Multiport Adapter, and the HDMI output has worked in the past. When hooked to my new ASUS monitor with an HDMI cable, ...
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18 views

Some Applications Muted on Mac when External Displays Connected

For some reason, whenever I plug in my external displays to my MacBook Pro (Retina, 15-inch, Mid 2014), certain applications seem to mute themselves. My audio output is set on Internal Speakers. One ...
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132 views

Resolution problem on external display with Thunderbolt->HDMI adapter

Let me explain problem in quick bullets: What I want: I would like to use ultra wide external display with 3440x1440@50hz resolution with my MacBook Pro (Retina, Mid 2012). I would like to use my ...
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45 views

MacBook Pro Connected to External Monitor issue

I connect my Macbook to an external LCD screen, using their VGA and HDMI ports. When I try: The LCD is black with no signal The MacBook flickers LCD screen, VGA-HDMI cable checked and work fine. ...
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76 views

How not to miss the elimination of Optical Audio Output from 3rd to 4th gen Apple TV

I speculate that the audio signal at the Optical Audio Out of the 3rd generation Apple TV is always the same audio signal within the HDMI output. I further speculate that that's the reason behind ...
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32 views

3xHDMI out of a single Thunderbolt port - 2015 MBP

I'm planning on purchasing 3 HDMI monitors to use as a workstation for my MBP. For the sake of ease and convenience, instead of using the native HDMI + 2 mini DP to HDMI adapters, is there any way to ...
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51 views

Can a faulty HDMI cable damage macbook

I tried to connect my rMBP mid-2014 to a TV through an HDMI cable. I first plugged the cable to the TV. when plugging the other end of the cable to the HDMI port on the macbook, I heard some crackling ...
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10 views

Everything chopping after I power off additional monitor or TV

I'm using iMac mid 2014 with additional monitor (one thunderbolt to HDMI) and connected TV (Panasonic Smart TV on other thunderbolt to HDMI). Everything is ok and working perfectly, but I'm using TV ...
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227 views

Use an iPhone as cabled webcam / capture camera stream from hdmi out?

I am wondering if there is a way to use an iPhone as a usb webcam. I saw solutions for wifi and friends but none of them seems to work for a cabled connection. Alternatively, I know that it is ...
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227 views

No sound on external monitor using El Capitan

Although this question has been asked and answered many times on this for earlier OSXs, I have not found a solution here or elsewhere that works with El Capitan. The problem is: No audio when playing ...
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140 views

Connect MBP 2015 to 2560x1440 IPS monitor via HDMI?

I would like to connect my Crossover IPS monitor which only has a single dual-link DVI port on it to my MPB I realise that by paying the apple tax of $165 I can get one of apple's buggy dual-link mini ...
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114 views

Wifi problems when using mini display port

I have two monitors that only have HDMI ports. With my late 2013 Macbook Pro, I connected one using the HDMI port and another with a mini Displayport to HDMI adapter. Specifically, I bought this one:...
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48 views

HDMI to DVI-D works only when an additional VGA device is connected at start

I have a problem about connecting DELL P2014H monitor to my macbook pro (13" retina, 2013 late). Monitor does not respond when I connect the HDMI-DVI-D cable but, If I connect HDMI-DVI-D cable and VGA-...
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42 views

How to use a Mac Mini to power 4 tv's

We are looking to setup monitoring and a dashboard at work, and want to use a Mac Mini powering 4 Samsung 50" TVs (1080p). According to the official Apple Spec, it only supports 2 displays using the ...
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26 views

2 monitors and 2 HD tv form late 2013 MacPro - can this be done?

I have 2 x 28" LED monitors connected to my late 2013 6 core MacPro (the back bin shape) by HDMI from monitors to mini display ports in the back of the Macpro which work great - But I want to add a ...
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92 views

External Display on Macbook Pro 13" Late 2011

I have a Macbook Pro 13" late 2011 and a DELL S2340L Display. I am using a mini display port HDMI adaptor to connect to my dell monitor. I have had no problems using the native display resolution of ...