Hello all, I've got an Orange Crush 15r that was knocked over at a party and since then it makes a very loud static noise when the gain is set anywhere above 0. The sound increases and decreses with volume. When using headphones the sound comes out of the headphones not the speaker so I'm guessing it's not a speaker issue. The noise exists if a guitar is plugged in (you can still hear the guitar as well) and also exists if nothing is plugged in, however, if I plug in a guitar cable with nothing on the other end of it the noise stops.

I've checked the Earths and they seem to be connected OK, and checked the board and can't see any obvious soldering issues. Does anyone have any thoughts on what the problem could be? Any help would be greatly  appreciated