on my brothers macbook (2.1ghz 10.5.5) the "p" stopped working when he booted it up this morning. if you hold shift and then hit "p" you get a capital P as usual. if you hit command p, you get printing. when you just "p" by itself, nothing happens/types. he says it worked fine last night and then when he turned it on today, it did not work. i'd appreciate any tips/help. thanks!