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Check your "A/B" speaker selector switch on the front panel of the receiver, if they are on, you will see "A" "B" or"AB" on the front display. If they are on, You need to have the receiver serviced. Just a note, Yamaha's rarely have an output problem! Hope this helps
I understand that you have tried connecting different audio source to the Receiver as some of the audio source will output only 2 channel audio.
I hope you have tried changing the Input mode and Input selector to get the surround sound.
Please disconnect the speakers with the receiver and clean the edges of receiver and speaker cables using solution like alcohol and try.
If the issue persists, please interchange the rear speakers with front speakers and vice versa and check if audio is coming to make sure that the speakers are working fine.
If the audio comes after replacing the speakers but not from surround speakers, the receiver requires service.