Use any of these methods to open Displays preferences: If the video on your HDTV or display extends beyond the borders of the screen, open Displays preferences and adjust the Underscan slider for a better fit.
Unplug the HDMI cable from your Mac, then plug it in again.Turn off the HDMI device while your Mac is turned on.If your Mac doesn't recognize your HDTV, display, or other HDMI device after making the connection: If using an adapter, check the specifications of the adapter to learn about supported resolutions and other details. Safari in macOS Sierra or later also supports HDCP-encrypted playback, if the web page is HTML5-enabled and the content is FairPlay Streaming-enabled and delivered using Media Source Extensions or HTTP Live Streaming. HDCP-encrypted playback from iTunes and QuickTime Player (version 10).8-channel/24-bit audio at 192kHz, Dolby Surround 5.1, and traditional stereo.At least 1080p video over HDMI, and some Mac models support higher resolutions when connecting to 4K displays, 5K displays, and Ultra HD TVs.Mac computers that have an HDMI port comply with HDMI 1.4b and support:
Mini DisplayPort: Connects to HDMI using a third-party Mini DisplayPort to HDMI adapter or cable.
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Learn how to identify the ports on your Mac. Mac computers that have any of the following ports can connect to HDMI devices.
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