I recently sold my Bel Canto PRe3 preamp to a nice seeming guy.

All was well until this morning when I got this message ....

I've swapped around some leads this morning, so that, for the first time I'm using the balanced input, which is working fine. As was the phono input when I used it before. The sound is fine. The problem that I'm now having is, with the xlr's connected, when I try to connect any of the phono ins, I'm getting a very loud buzzing on all of them. I've tried selecting the appropriate input on the display, and using various sources, but without anything affecting the resultant buzzing sound.

It worked fine for me.
Suggestions anyone? (I suspect a grounding issue in his system somewhere).

Ta.

Here's a pic of the rear connectivity ...