If the speaker wire touched one of the mains connection, it's possible that a component inside the receiver is now just dead, either open or shorted. If so, you'll likely need professional repair.
That kind of short can totally kill a component. NEVER let the wires connected to the receiver touch the mains wires!
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
