I just changed my strings, and whenever i play an open string there is a strange buzzing sound near the nut. Before i had D'arddio strings and I'm using Ernie Ball strings.
Go the Electric Guitar forum.
Does the sound come from the nut itself or are the strings hitting the 1st fret? Did you switch to a significantly different gauge? If the buzz is from the nut try lubricating the nut slots with a bit of pencil lead.