Change input setting in mac keyboard In my keyboard when I pressed this key



Then I get/display  '§' (with shift+key -> '±' ) instead of what  expected. 

How can I set it to work properly?

Also after  Googling I found this site but this did not help me.
My guess is that your machine thinks the keyboard "type" is English (International) ISO, when it is really English (USA) ANSI.  This article may help:

http://m10lmac.blogspot.com/2009/12/fixing-keyboard-type-problems.html