Calling all guitar players

[poboy]

This has to be a problem with either the string or the fret itself. A problem with the neck would affect more then just one note. Do the other strings sound fine at the 3rd fret? Try changing the string, this is obviously quick and cheap and you can then rule that out. Also check it against a tuner, even if you normally have perfect pitch sometimes your ears can play tricks on you. JMO