Here's something I can't figure out. I have a S4 Zoom Jr. circuited into a portable dimmer pack. The pack is getting power. I used a circuit tester to check the cable from the pack to the instrument and that is also wired correctly and getting power. I used a lamp check (Edison, from BMI) to check the lamp and it says it is good. The problem: IT WON'T COME ON! I changed the lamp, still nothing. Any suggestions? And I'm pretty sure the instrument worked during our matinee this morning, but it took a dump for our evening show. I'm so confused!