I bought a Quadraverb GT some months ago (not Shadows programmed), and never checked it. On trying it recently I found it powered up ok, shows all the patches ok, but all 4 LEDs come on and stay on, and no sound will pass through the unit at all.
I've visually checked inside and can see nothing amiss, like fried components, obviously faulty joints etc.
Could anyone shed any light on possible problems, things to check etc?