I know this is probably falling on deaf ears (or eyes) but if it is not obvious what is the power connection inside the unit, and you don't know what is part of the power supply or not, you should NOT muck around inside. You wouldn't take apart the engine of your car withoug any knowledge of it's workings would you?

Again, coming from my humble experience, there are many things that can change the sound of a component, but changing the power cord is not one of them.