So last night, as I wrap up practicing, I go to switch off my SVT-3PRO head, and the switch won't move. "Huh?", thinks I, who then tries again. Still doesn't move. Then I give it justa little extra. *Snap* Power stays on, switch flips back and forth, nothing happens. What have I done, and should I crack it open to find out, or wait for a professional to look? It's plugged into a power strip, so in the meantime, that is my power switch. Is that going to do any damage if I use it in lieu of the amp switch? Does it defeat the 'warm up' function somehow?