Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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.

share|improve this question
up vote 3 down vote accepted

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!

share|improve this answer
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? – James Aug 4 '10 at 4:12

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.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.