Solid advice, the best place to start. Also turn any knobs on that screen full stop to one side or the other and leave them. If the screen saver activates, move one of the knobs somewhere in the middle of its range and try again. If the screen saver doesn't activate or you see a value jumping, the pot may be fixed by simply turning it back and for from stop to stop around 10 times. If that doesn't fix it, contact support and we'll get it sorted out for you.