Logitech Z-680 Speakers and DVD218 System "subwoofer sudden started blowing fuses" Questions

subwoofer) that fixed the problem. Two weeks later, blew the fuse again. I cannot find the fuse to buy anywhere. Also, would love to have the problem fixed. Any advice would be greatly appreciated. PS

...subwoofer light does not come on and there is not any sound coming out of any of the speakers. This just happened all of a sudden and I do not know what to do. I have tried unplugging and replugging ...