Use your TV as a display with Mac
You can use many TVs as computer displays. To connect your Mac to your TV, you need a video cable that connects your computer’s display port to the video input port on your TV. If you can’t find a cable that connects the ports on your Mac and TV, you may need an adapter for the cable. (You can also use AirPlay. See Use AirPlay to stream what’s on your Mac to an HDTV.)
If you have an HDTV and a Mac with a Thunderbolt port 
, Mini DisplayPort 
, or HDMI port, you may also be able to play audio from your computer on your TV.
Connect your Mac to your TV
Connect one end of the video cable (or an adapter, if necessary) to the computer’s Thunderbolt port
, HDMI port, or DVI port , then connect the other end of the cable to the TV’s video input port.If you need to adjust the resolution on your TV, choose Apple menu
in the sidebar. (You may need to scroll down.)Select a resolution, or click Default to automatically use the best resolution.
If you want your HDTV to play audio as well as video from your Mac, choose Apple menu > System Settings, click Sound
in the sidebar (you may need to scroll down), then click Output on the right.Select your HDTV in the list of devices. If you want to play audio on a different device (such as your computer’s speakers or an AV receiver that’s part of your sound system), select it instead.
Note: If your Mac has a Mini DisplayPort
, make sure you use a cable (and adapter, if necessary) that supports both audio and video.
Check whether you can play audio from your Mac on your TV
If your Mac has a Mini DisplayPort, it may be able to send audio to your HDTV.
Note: If your Mac has a Thunderbolt or HDMI port, it can send audio to your HDTV.
Choose Apple menu
in the sidebar. (You may need to scroll down.)Click About on the right, then click the System Report button.
In the sidebar, in the Hardware section, select Audio.
A list of your computer’s audio devices appears. If HDMI Output or HDMI/DisplayPort output is listed, your computer’s Mini DisplayPort can send audio.