3 Replies Latest reply: Oct 14, 2013 5:02 PM by coander15
luddinizwe Level 1 Level 1

So, I connected an HDMI-cable into a Mini DisplayPort and into my Thunderbolt on my MacBook Pro, but I don't get a picture on the TV? It has worked numerous times before, with the same TV and the same computer.

As soon as I connect the cable into Thunderbolt the screen turns blue and after a while it loads back up again, just as it would do normally, but this time nothing shows up on my TV.


There's nothing wrong with the HDMI-cable since I just tried connecting to my DVD-player and then it works fine and I do get picture from my DVD-player, but not when I connect it to my MacBook Pro.


Anybody knows what I should do? Thanks!

MacBook Pro (13-inch Early 2011)
  • coander15 Level 3 Level 3

    Are you attempting to run in clamshell mode or are you just attempting to mirror what is on you MBP's display? And when you say you have done this numerous times before, do you mean numerous times before via HMDI or another connection?

  • luddinizwe Level 1 Level 1

    Thanks for your reply!

    Usually the TV works as an "extension". If I for example are going to watch a movie, I start playing it on my computer, pull the window over to the TV and then hit full-screen.

    When I say I've done this numerous times before, then I mean that it has worked before. With the same cables, the same TV, the same computers etc. Now the TV doesn't seem to get a signal.

  • coander15 Level 3 Level 3

    It sounds like it may be related to the TV, as long as you can confirm that you have not made any adjustments to your Mac's preferences. If you are still stuck take a look below:


    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 resolutionStart 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.