Here are two reset procedures for you if you want to try that route. (NOTE - the will put your settings back to Denon defaults):
Microprocessor:
- Open the front panel
- Keep the DSP SIMULATION and STANDARD buttons pressed while turning on the power (the little button).
- Release the buttons after seeing 3 flashes
Standard:
- Open the front panel
- Keep the UP and DOWN buttons (on circular pad) pressed while turning on the power (the little button).
- Release the buttons after seeing 1 flash
Hope it helps.
