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Moshi Mini DisplayPort to HDMI Adapter (FAQ and Troubleshooting)

This troubleshooting guide will help you with some of the most commonly asked questions regarding your Mini DisplayPort to HDMI Adapter

1. How do I know if my Mac supports audio via Mini DisplayPort?

Your computer might have a Mini DisplayPort, but it doesn't necessarily mean that it supports audio pass-through. 

The following Mac/Apple computers support audio pass-through via Mini DisplayPort.

MacBook 13" Model 7,1 (Mid 2010)
MacBook Pro 13" Model 7,1 (Mid 2010)
MacBook Pro 15" Model 6,2 (Mid 2010)
MacBook Pro 17" Model 6,1 (Mid 2010)
MacBook Pro 13" Model 8,1 (Early 2011 / Thunderbolt)
MacBook Pro 15" Model 8,2 (Early 2011 / Thunderbolt)
MacBook Pro 17" Model 8,3 (Early 2011 / Thunderbolt)

MacBook Air 11" Model 3,1 (Late 2010)
MacBook Air 13" Model 3,2 (Late 2010)

Mac mini Model 4,1 (Mid 2010)

iMac 27" Model 10,1 (Late 2009)
iMac 27" Model 11,1 (Late 2009)
iMac 21.5" Model 11,2 (Mid 2010)
iMac 27" Model 11,3 (Mid 2010)

Mac Pro Model 5,1 (Mid 2010)

If you do not know which model Mac you have, go to About this Mac > More info and then check the Model Identifier field in Hardware Overview. 

model identifier

2. My HDMI cable is connected but there is no audio. 

In System Preferences, select Sound. Click on the Output tab. Select your HDMI Device from the list. 

3. My Mac supports audio but there's still no sound?

Make sure both your HDMI cable and TV are VESA compliant. Some older model TVs only accept video signals on the HDMI input and will require a separate cable for audio input. Please reference this article for further details:

4. My Mac does not recognize my HDTV. 

Leave your Mac mini turned on while you power off the HDTV.  Unplug the HDMI cable from the Mac mini and plug it in again.  Power on the HDTV. Make sure your TV is set to the correct input channel. Usually this is HDMI 1, HDMI 2, Video In, etc. Verify the cables used adhere to the HDMI 1.3 standard. Even though the logo on your TV says it supports HDMI, the actual HDMI chip inside your TV may be outdated.

5. I see black bars on the edge of my HDTV. 

This is because the aspect ratio on your Mac slightly differs to the one on your HDTV. However, in the 10.6.5 upgrade to Snow Leopard you can fix this by adjusting the Underscan slider.

System Preferences > Displays.

6. The top menu bar on my Mac has disappeared.

Similar to Underscan, you can modify the Overscan to shrink the image so to fit your screen. Adjust the slider to bring the menu bar back to its appropriate location.

System Preferences > Displays.

7. Why can I only see the default desktop background of the purple galaxy on my HDTV? 

This is because you are in Extended Mode.

In the screenshot example above, the Mac screen is on the left and the HDTV is on the right. (The HDTV is the "Extended" screen.) You can customize this arrangement and position the Extended screen on either the right or the left.

To view your movie on the Extended screen, simply drag your file over to the HDTV and then select Full Screen in your video player application. In both VLC and Quicktime this is easily accomplished using the Command-F keyboard shortcut.

In most situations, we recommend Extended mode because it allows you to maximize your screen real estate. This is especially useful if you are connecting a MacBook or MacBook Pro to an external LCD display. Most power users take this approach and work in 2 different applications, one on each screen.

However, there are times when you want to mirror the image on your Mac to your HDTV or external display. You can do this by simply clicking on the Mirror Display option.


This allows you to view the same image on both screens. Useful for presentations, classroom tutorials, or watching movies.

8. The video or audio used to work perfectly, but it suddenly stopped working.

Unplug and then plug in the connecting cables to guarantee a secure physical connection exists. This is also an important step if you've recently gone through a Software Update via Mac OS X's built-in upgrade tool.

9. The video looks blurry or out of sync on my TV.

Your TV may not support the video resolution on your Mac. Try different resolution settings on the MacBook by going to System Preferences > Hardware > Displays.

10. The video or audio is choppy or comes on and off.

Please make sure your cable meets the HDMI 1.3 Specification (for more details visit Other possible causes include incompatible video file formats or an outdated media playback application.

11. Which audio formats are supported via Apple's Mini DisplayPort?

Recent Apple/Mac models (see above table for compatibility list) do support multi-channel 24-bit digital audio output such as Dolby Digital Surround and DTS as well as 2-channel stereo. Our Mini DisplayPort to HDMI adapter is a translation device that would then pass the audio bit stream unaltered to your AV receiver or TV for further processing. 

12. I have an audio-enabled Mac, the correct Moshi Mini DisplayPort to HDMI adapter, a HDMI 1.3 compliant cable, a completely updated version of Mac OS X with all the proper software settings but I still can not get audio output on my TV. What do I do now?

If all else fails, it's likely that your TV is an older model which doesn't support audio input on its HDMI port.  Please check with your TV manufacturer on the specifications of your TV's built-in HDMI chip. (In some situations the HDMI chip is only HDMI 1.1 compliant.) In this case, you may need to purchase a separate mini-stereo (3.5mm) to RCA Y-cable to output audio from your Mac to your HDTV.

If you're still experiencing problems, please feel free to contact us and we'll try and help you troubleshoot further.