It's a 350 watt PS. When I plug it in, and it's not connected to anything it doesn't seem to fire up. Shouldn't the fan turn on even though it is not connected to any computer peripherals? I hooked it up first to a computer and it didn't fire up the computer, but then there is a possibility the MB is fried. However, I'm not sure about this. The computer went out in a storm, there was odor, but the MB doesn't have any burn spots anywhere. Thoughts on this would be appreciated.