did u test the AM/FM tuner? other components (CD player, tape, phono, etc.)? do a system reset? verify that the HDMI input/output cables are not the issue? they do fail occasionally.
Personally I'm a fan of the Yamaha Aventage line of AVR's but you'll find all kinds of fans here; Denon, Marantz, Anthem, Rotel, etc. recommending why u should buy their preferred brand. good luck. hopefully a reset or replacing a defective HDMI cable does the trick.