Onkyo TX-NR901 No 5.1 Surround Sound

I have a Onkyo TX-NR901 that I cant get the surround sound to work.
The two front speakers will work or the center and two rear speakers, but not all at the same time.
I have tried every configuration I can think of. If any body has come accross this issue I would appreciate your help.

Hi Moyogi,

Have you tried it on "all ch st" (All Channel Stereo) using the DSP buttons on the front of the unit to see if you can get all the speakers to play. Also keep in mind that not all the speakers are going to play all the time as it depends on the signal coming in.

I have tried "all ch st" I would also like to add when doing the speaker test I hear all the speakers
except the left & right front. It seems that it may need service.

Hi Moyogi,

Before you send/take this to a service center for repair I'd like you to try reversing the speakers in question to make sure that it is the receiver.