Try pressing two keys at once. Computer make a beep? Then it's registering you hitting three keys at once, a feat many keyboards (PS/2 interface ones, anyway) aren't capable of. Thus, the computer says "what the heck is going on" and then beeps out an error.
Failing that, I'd still say you'd do well to pry off that "S" key and see what lies below. I figure it's a hardware issue.
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