Just took my Epiphone Thunderbird off the rack for the first time in months. Plugged her in, and there was an awful, quiet, thin, sound with zero b***s. All of the wiring seems to be intact still. Nothing is out of the ordinary. The jack "tab" thing (where the jack makes contact with the cable end) had some strange coating that looks like it accumulated there over time, but I rubbed most of that off with my finger. And yes, my whole rig works fine. Please! Any solutions?!?! Thanks!