The title says it all. I recently bought a used Spider lll 120 Watt 2x10 in nice shape from a local music shop. It came with an FBV footpedal. It worked fine when i tested it in the shop, but when i got it home and plugged it in it didnt fully come on when i threw the switch. The preset screen lit up and had eight black blocks in it. None of the other lights worked (amp model lights,effects lights, tap tempo etc.) but then i turned it off and immidately turned it back on and everything worked fine. This phenomenon is repeatable. So what's up with my amp? I appreciate any help/advice anyone can give me.