to see if the problem is with the keyboard or the computer.
If the problem goes away with the second keyboard, then the first one is kaput.
Any warranty left on that mac?
P
The keyboard (wired) i<span>ts not working properly, keys are being touch but show different characters or multiple characters.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic