Remote doesn't operate reciever
Hello Fixya customer,
Thank you for your question.
Please determine if the "Audio" button is actually working.... after pressing the audio button, can you still control the DVD, if not then the remote has switched to the Onkyo. Although, this is not 100% conclusive, unless you have a 2nd remote to test the Onkyo with, it provides a sound basis to proceed.
Assuming the remote is transmitting and the IR receiver on the front of the Onkyo is not otherwise blocked, likely faults include the IR receiver, input to the Micro processor, and the Micro processor.
The most probable fault is the IR receiver.
Thank you for using Fixya, and if I can help you further, please let me know.