I have a Windows 7 PC, and I think it has something to do with the F3 key. I don't have the Fn (function) key, I tried pressing F3 with all the keys I have, and have had no luck.

  • Do you get any information at all when you press f3? – Studoku May 23 '15 at 14:56
  • Do you have an f lock key? – Dorian Dore May 23 '15 at 15:33

You only need to press the function key (fn) if you have little functions assigned to the keys themselves:

For Example

I have a brightness up on my F3 key, but I need to press fn+F3 to use it, but this does not affect my controls when playing Minecraft or any other action that requires the use of F3.

When in doubt, never forget there's a wiki.

This link may help as well.

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