7 Replies Latest reply: Dec 13, 2015 1:40 PM by ApMaX
kaylenrose Level 1 (0 points)



I'm trying to hook up my macbook pro to my new panasonic viera smart tv. I'm using an HDMI cable connected to a mini hdmi to my mac. It's always worked fine with my old tv and now on my new TV I'm getting a "no signal" message on my TV. If I check Display and Audio in my system preferences it shows the TV as detected.


Can anyone help me figure this out?



  • Allen A Community Specialists

    Hello kaylenrose,



    There are a number of things worth looking into detailed in the following article.


    Apple computers: Troubleshooting issues with video on internal or external displays



    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 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.






  • kaylenrose Level 1 (0 points)

    I'm still getting a no signal on the tv.


    I contacted Panasonic and they said they don't support computers, only home theatre equipment. But when I switch through the HDMI inputs one of them is marked computer. Is it possible that it really won't reconize my computer.


    Also, when I go to displays, under the PanasonicTV0 display it says "Usable resolution 1280 x 800) which isn't an option in the list. The closest is 1280 x 960. The other display screen "color LCD" has 1280 x 800 and that is what is selected.

  • Ostracode Level 1 (0 points)

    I am also having problems connecting macbook pro to a new panasonic smart tv via HDMI.  The TV does not seem to detect the connection and the mac also does not detect the TV.  The "mirror" option does not appear, apparently because the mac isn't detecting a connection to the TV.  Can anyone help?

  • jennyetmoi Level 1 (0 points)

    I am having similar problems connecting my MacBook Air 11" via a miniport-HDMI cable to a Panasonic Viera LCD TV (TX-37LZD850A). The MacBook Air does not recognize the TV in the Display configuration, and the TV display for the relevant HDMI port remains blank.


    I have tried to connect the MacBook Air to 2 Panasonic LCD TV's using the same cable with the same result each time, yet connecting to an LG or Samsung TV both resulted in the display from the MacBook appearing almost instantly on the TV's and the TV's each appearing in the Display configuration of the MacBook when connected.


    I have not found any hint of a solution to this in the Panasonic TV's handbook either

  • Mastaboeba Level 1 (0 points)

    Hello !


    I had the same problem !


    What i did was, i used the other end of the hdmi cable to go into my mac... so i basically just turn the cable around.. and for some reason it worked.

    Hope it works for who ever reads this !



  • ApMaX Level 1 (5 points)

    I had the same problem ("no signal" message) using a Mac mini late 2012 (HDMI port), but fixed it just pressing the Panasonic Viera remote-control top right Input-AV button. Great!

  • ApMaX Level 1 (5 points)

    Update: it may be necessary to reboot the Mac for the TV to show the video. On the other hand, clicking the "Aspect" button of the TV remote control and selecting "Sidecut Zoom" may be needed to show full screen (if Automatic or other setting does not do it right). Just for the record.