My Denon AVR-2802 reciever gave it up after a continues high power operation. The unit is mounted completely air free,so ventilation could't have been the problem.However I turned off the power,let it cooled down and turned it back on. Only the standby led keeps flashing. The input mode indicators does not light on,and no sound any more. I have done every step the trouble shooting guide says but nothing works.Any sort of help would be greatly appreciated. Thanks!