Hi. I have had my JTV-69 for about 3 years. Last year I had an issue where it wouldn't turn on (cable connected and pushing down on the volume knob didn't do anything). I sent it back for repairs and everything seemed fine. Just recently I've experienced a twist on this. It works fine when plugged in via a Variax cable to my POD XT Live, but when I plug in a guitar cable it doesn't want to turn on for some reason. I've heard about the possible remedy of stuffing a wad of paper inside the volume knob to make a better connection but where it turns on when connected via Variax cable makes me think it's something more. Any help would be greatly appreciated.