Had a great session last night with the band, half way through the night, the amp had no sound, so I look at it and all the lights are out, stand by etc. Look on the back and the tubes still seem to be lit up. Still not sure what was happening my guitar player says you have lights on again. I'm thinking maybe the fan in the amp it's self quit working, is this a problem with the SVT2PRO? Could have fried an egg on the top of that head last night. Haven't been on the site for some time, going to take some getting used to the new format. Take care everyone. Good to be chatting again with ya's.