How to fix non-working keys on a MacBook?

My girlfriend can't even sign in because some of key letters on her password don't work. Neither do a bunch of other letters, some symbols and some numbers. Is there a fix for this?
The CPU is an old "Tiger" model, about three years old. If it was a new keyboard spread, would they still be available...? Or could it be a software problem?
She didn't spill anything on it or dropped it. She just can't sign in cause of these keys that don't work.


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