IMac A1311 broken internal monitor need to set external as primary

My internal monitor's backlight is no longer working.
I connected an external monitor, but I need to set it to mirror mode or to primary.
F7 key doesn't work

David,
If you leave the internal display open, you cannot turn it off, but you can turn the brightness down to zero.
You can in fact run the Lombard with the display closed if you have a USB keyboard, mouse, and external monitor. You must have the power adapter connected to run with the external monitor according to Apple.
http://docs.info.apple.com/article.html?artnum=58334
The default setting for an attached external monitor is extended desktop and you want mirroring; resetting the PRAM defaults to extended desktop.
To find your System Preferences or Displays panel...
- Select All (command-A) > then start click-dragging across the screen until you find the HD icon > open the HD icon and find the Applications folder > System Preferences > Displays.
- Or try this: Find... (command-F) > enter Displays in the search field.

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