I figured out the solution last night. In frustration, I went to the keyboard 
pane in preferences. One of the options was to use function keys as regular 
function keys. I check the box, and guess what, all of the function keys worked 
as function keys.  Problem solved.

Tom .
On Feb 11, 2012, at 8:19 AM, Frank Tom wrote:

> My friend just bought  a 21.5 inch I Mac with extended USB keyboard. In key 
> describer mode, the f1 through f4 and F7 and F8 keys do not work.  Is there  
> a special key combination to enable these function keys or did he just get a 
> bad keyboard? 
> 
> Thanks.
> 
> Tom Frank

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