I have a cello I just bought used. It was hardly played. Probably because of the buzzing.
Have not played since High School and trying it again. I have played guitar for years and work on my own instruments. Familiar with basic guitar setup.
On this cello it does not buzz on open strings. When fretting the A and somewhat D string in first or second position it buzzes very bad.
I attached two pictures. In the first I used a straight edge and there is light between the straight edge & fingerboard from just below the nut to the top of the body. In the second picture my