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This leads me to believe that there is something within the software 'inhibiting' the use of this cable. Solution 4: Through Device Settings You can also resolve audio errors by choosing the accurate speakers for your system. This should fix the sound issue on your Mac device. Click on the HDMI and set the option of ‘Format’ to 41000.00 Hz and restart PC. I find this very strange, as the product specifications of the Thunderbolt-HDMI cable implied it would easily work for my Macbook Air. On that window, you can find the HDMI device on the left side of the menu. Many of the forums I have read say there should be an "Arrangement" tab, but this is not appearing on mine. However, when looking in System Preferences/ Displays, there is no trace of any external screen. I am pretty sure the port works because when I plug in the HDMI into the dongle the monitor lights up but and then shows a no signal screen. When connected to the TV via the Thunderbolt-HDMI cable, a blue screen briefly appears on the Macbook. My Multiport Dongle is working, the USB-A and USB-C ports the dongle have work perfectly on my MacBook Pro, they problem is the HDMI. I tested to see if it was the cable which is the problem by connecting it the Thunderbolt port of a laptop supporting Windows 7 and it worked PERFECTLY on my Samsung television. I have scrolled and read through a VAST amount of forums and so-called "help pages" on the internet but can't find anything that works for me, however there do seem to be many people with the same or similar problems. I have spent all day trying to get my Macbook Air (OS X 10.8.4) to display on various televisions via a Thunderbolt-HDMI cable, however I am yet to suceed.