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It has [A]/[B] printed on it, where [A] is LCD inside a box and [B] is a monitor symbol. Pressing it just turns the screen off for a second then back on.

Also, what does fn-f9 do? It looks like a square with a diagonal through it and two smaller squares inside. Pressing it does nothing as far as I can tell.

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Judging by your descriptions fn-F8 would switch the output to an external monitor if one were plugged in and fn-F9 would enable/disable the trackpad.

Test it, and let me know!

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I don't have another monitor to test fn-F8, but the trackpad still works after pressing fn-F9. – Steven Aug 3 '10 at 16:40
Is it on this picture of an asus laptop that google gave me? animalcules.files.wordpress.com/2008/12/keyboard.jpg – James Aug 4 '10 at 4:12
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Fn then F8 brings connects a tv via the HDMI cable. The first time displays a laptop the second press shows a HDMI cable graphic and connects to the TV. I have yet to get the audio to work but video is fine.

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