On 10/2/2013 2:07 PM, William Sommerwerck wrote:
The keys are electrically positioned on a grid. If one column or one row
of the grid goes out, then all the keys in that column or row will
(probably) go out. So it's not likely to be a problem with the internals.

That leaves the key switch itself (which would require dismantling), or
something keeping the key from being depressed all the way. It could
very well be -- as Scrooge would say -- "an undigested bit of beef, a
blot of mustard, a crumb of cheese, a fragment of underdone potato". Pop
the key cap, and see if anything is caught under it.

How to remove key from keyboard.

https://www.google.com/search?q=how+...ient=firefox-a

Mikek