There's something wrong with my guitar.
When I try to play, there's no sound. Except for feedback. When I touch the strings, they buzz, but no sound other than the buzz comes out of the amp. When I touch the plate thing around the input jack, it buzzes pretty badly too. This happens with on all of my amps, and my other guitar works fine with these amps, so it's definitely the guitar.
Any ideas?
Something similar happened to me. If your pickups are active, try replacing the battery. Every time I would hit my strings before they died, all I would hear is a buzz