I have a Denon AVR 3310CI everything appears to work HDMI inputs recognizes speakers but zero sound ???

If you have verified that the Denon AVR 3310CI is properly configured and connected to the speakers but are still unable to hear anything, you can try the following troubleshooting procedures:
Examine the HDMI cables: Check to see that the HDMI cables are securely connected to the HDMI output port on your source device and the HDMI input ports on the receiver's back. To see if that resolves the issue, try substituting new HDMI cables.
The microprocessor must be reset: The functions of the Denon AVR 3310CI are controlled by a microprocessor. Try powering the receiver back on while simultaneously holding down the "Power" and "Speaker A" buttons to reset the microprocessor.
Check the settings for the sound: Check that the sound settings on the receiver are set up correctly. To ensure that the settings are optimized for your particular setup, check the model's manual.
Aktualize the firmware: Check to see if the Denon AVR 3310CI's firmware can be updated. For additional information on how to update the firmware, you can visit the Denon website or get in touch with their customer support.
Use a different source to test: To determine whether the issue is with the receiver or the original source device, test it with a different source device.