Mac laptop to TV issue: mirror display doesn't work?

Solution 1:

It seems to me that the frequency you have your laptop configured at is not supported by your TV.

When using mirror displays, it usually mirrors your main screen (resolution & frequency). Your main screen would be the one where you have the Dock and Menu bar.

Can I ask why would you want to mirror display on your TV? Is this for watching videos? If so, I would recommend you to do the following:

• Connect your HDMI cable
• Click on detect displays, disable mirroring
• Install VLC player

With VLC you can use your second screen on full screen mode without the need of mirroring.