How can I choose to have my laptop AND tv show the same thing? My laptop goes black when I plug into tv with HDMI.

[Themandoman]

How can I choose to have my laptop AND tv show the same thing? My laptop goes black when I plug into tv with HDMI. I can't remember how I achieved this setting.

 

[Phillip Corcoran]

Control Panel > Display

On the left click "Change display settings" whilst external monitor is connected to laptop.