Any info on setting up 5.1 Audio on p750zm (Rear/side speakers do not work. )

So Ive tried to set up a surround sound system and I cant get the rear (Secondary right and left speakers) to work.

HOWEVER
when I turn on the reltek audio interface, and switch to 5.1, I can click the speakers to test their connection, and in there I clearly hear the two side speaker tests, but when I play a game or go on youtube, only the front L/R center and sub will play.

Ive triple checked to make sure everything is plugged in the right spot.

Also, the audio jacks are self...

Any info on setting up 5.1 Audio on p750zm (Rear/side speakers do not work. )

Any info on setting up 5.1 Audio on p750zm (Rear/side speakers do not work. )