No matter which board I put in the machine, when I power it down, I get a bunch of garbled sound feedback for about a second. Not sure what is causing this. I'm sure its somethig simple and stupid, but i'm at a loss.
Now does it only happen with your one board or have you tried others with the same result? No matter what board I put in this machine, it does the same thing. I'm wondering if maybe I have a wire crossed or something isn't grounded.