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you could set the imac's screenn to primary then sort out the tv's settings then set the tv to the primary screen again
 
Go to system preferences and change the setting:

1. Press Command + F1 to enable menu selecting
2. Press Control + F2 to go to menu
3. Press the down arrow key on the keyboard 5 times
4. Press enter, it will open System Preferences
5. Click on display and change setting
 
Go to system preferences and change the setting:

1. Press Command + F1 to enable menu selecting
2. Press Control + F2 to go to menu
3. Press the down arrow key on the keyboard 5 times
4. Press enter, it will open System Preferences
5. Click on display and change setting

it dosnt work

thanks for trying
 
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