3490b541__String_Buzz___Chart_Of_Causes__Possible_Cause
[Symptom] Open String Buzz Buzzes when played open, stops when string is fretted. [Remedy] Replace nut or shim to add height. Set up instrument properly. [Possible Cause] 
Nut Worn or poorly cut nut slot is placing the strings too close to the frets near the nut.
Why Is My Guitar Buzzing? How To Fix Fret / String Buzz | Chart Of Causes
Possible Cause