spvalentine
Level 1 (0 points)

Q: HDMI to mini display port problem

I bought an early 2014 13" Macbook Air running on OS X Yosemite. I also bought a mini display port to HDMI port adapter (Apple Brand) as the Macbook Air does not have an HDMI port. No matter what I try (unplugging it, plugging it back in, in every combination of the adapter, the HDMI cable, the tv, etc.) I'm unable to get anything other than a flash of a black screen on my laptop and a No Signal message on my television. The cables are all hooked in correctly and the tv is on the channel corresponding with the HDMI cord placement, but still there is no connection happening seemingly. Does anyone have any ideas as to why this is happening?

MacBook Air, OS X Yosemite (10.10.2)

Posted on Mar 25, 2015 1:51 PM

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spvalentine

Q: HDMI to mini display port problem

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  • Helpful answers

  • by alex_h1,Helpful

    alex_h1 alex_h1 Mar 28, 2015 10:45 AM in response to spvalentine
    Community Specialists
    Mar 28, 2015 10:45 AM in response to spvalentine

    Hello spvalentine,

     

    Thanks for using Apple Support Communities.

     

    To start troubleshooting this issue where your TV is showing No Signal with your MacBook Air plugged in, please follow the troubleshooting steps below.

     

     

    No video or no signal, image distortion, "snow," or flickering

       

    Check connections

    When using an external display be sure to check the following:

    1. If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.
    2. Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:
    3. Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
    4. Try unplugging the video adapter or cable and then plug it back in.
    5. If more than one video adapter is in use (or "daisy-chained"), troubleshoot by using only one adapter.
      • Example: A mini DisplayPort to DVI adapter connected to a DVI to HDMI adapter is an unsupported configuration because there is a series of adapters in use.
    6. If available, try using a different display and or adapter (or use a different connector by using DVI instead of VGA, for instance).

    Reset the system

    You can reset the Mac's parameter RAM and SMC.

    Reset the resolution

    Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:

    1. Start up in Safe Mode.
    2. From the Apple () menu, choose System Preferences.
    3. Choose Displays from the View menu to open the preferences pane.
    4. Select any resolution and refresh rate that your display supports.
    5. Restart your computer.

     

    Take care,

    Alex H.

  • by heix1234,

    heix1234 heix1234 Apr 2, 2015 6:30 AM in response to spvalentine
    Level 1 (0 points)
    Apr 2, 2015 6:30 AM in response to spvalentine

    I have same problem, but its started step by step and now its very painfull. When i connecting adapter then a flash of a black screen on my laptop and a No Signal message on my television. But some times it works too, no glue why. Today I went to store to test with other TV's and everytihg works with same adapter.

    I tryed safe mode, restart NVRAM - nothing better. I have both logs also, with working and not working.

  • by gtownblast,

    gtownblast gtownblast Apr 21, 2015 8:04 AM in response to spvalentine
    Level 1 (0 points)
    Apr 21, 2015 8:04 AM in response to spvalentine

    I have the same issue. It started about a couple months ago.

     

    I believe there is a bug somewhere with an OS update. We have two MacBook Air computers (info below) in our office. We have the Amazon mini display port to HDMI as well as the Kanex iAdapt Mini DisplayPort. The Amazon adapter was purchased a couple weeks ago and the Kanex was purched in 2012 and has worked flawlessly up until a couple months ago.

     

    I reset the PRAM to fix the issue. After putting the computer to sleep (lid closed) and opening, HDMI no longer works, regardless of TV or adapter.

     

    Fully reproducible on both of our macbook Air computers. Tried with two separate TVs and different HDMI cables. (and tried a variety of variations on this).

     

    shutting down computer or restarting does not fix. In fact after a restart and login i get the progress bar at about 5% and then the computer restarts again. (not sure if that issue is related or not)

     

     

      Model Name: MacBook Air

      Model Identifier: MacBookAir6,2

      Processor Name: Intel Core i7

      Processor Speed: 1.7 GHz

      Number of Processors: 1

      Total Number of Cores: 2

      L2 Cache (per Core): 256 KB

      L3 Cache: 4 MB

      Memory: 8 GB

      Boot ROM Version: MBA61.0099.B18

      SMC Version (system): 2.13f15

      Serial Number (system): [removed]

      Hardware UUID: [removed]

  • by gtownblast,

    gtownblast gtownblast Apr 21, 2015 8:44 AM in response to gtownblast
    Level 1 (0 points)
    Apr 21, 2015 8:44 AM in response to gtownblast

    SMC reset seemed to fix it: Resetting the System Management Controller (SMC) on your Mac - Apple Support

     

    will keep reporting on this (as this issue seems to creep back after time)

  • by gtownblast,

    gtownblast gtownblast Apr 21, 2015 9:23 AM in response to gtownblast
    Level 1 (0 points)
    Apr 21, 2015 9:23 AM in response to gtownblast

    after sleep the display no longer works (again)... one other thing to note is that the thunderbolt display works fine, the issue seems to be software/firmware when switching to HDMI.

  • by AmericaJr,

    AmericaJr AmericaJr Aug 3, 2015 5:18 PM in response to spvalentine
    Level 1 (0 points)
    Aug 3, 2015 5:18 PM in response to spvalentine

    Same issue. I really hope someone fixes this. It must have happened within the last 3 software updates because I was using a secondary monitor forever and all of a sudden it doesn't work. Just one laptop screen flicker and no signal on the monitor. Ive tried 2 adapters, 3 monitors, reset SMC, reset RAM etc.