Well, I'd heard about all the MB200 and MB115s with problems, but you never think it will happen to you Today I fired up my GK MB115 and it was dead. Light goes red and then blue as usual but no sound comes out. When you shut it down and play a note at the same time it will make a brief note before it shuts down. But while it is on... nothing... Bought this amp used but in perfect condition from a fellow TB'er. Although I've had it 3 months, I'll bet I haven't played through it more than 5-6 hours. But as a used amp... no warranty. If anyone has any suggestions they would be greatly appreciated!