TECHNICS AMPLIFIER

Question

MY AMP MADE A REALLY LOUD BANG. I GOT SUCH A FRIGHT I IMMEDIATELY STOPPED THE CD AND TURNED OFF THE SYSTEM. A WEEK LATER I TRIED IT AGAIN - SAME STORY BUT NOT IT WILL NOT PLAY SOUND AT ALL. THE RED POWER LITE COMES ON ON THE FRONT OF THE AMP BUT NOT THE ORANGE LITE. THERE IS POWER GETTING IN BUT BEYOND THAT - NOTHING ! I'M DISTRAUGHT AND NOT LOOKING FORWARD TO BEING RIPPED OFF WITH REPAIR COSTS. ANY SUGGESTIONS AS TO WHAT IT COULD BE AND WHAT I'M MAYBE LOOKING AT COST WISE.