I'm defiantly sure everything is in the right slot/spot, ive also tried it with just two speakers and the same thing happened. I tried the speaker test you were talking about the sound card program. Its doing the same thing there too. It plays sound from the "Front" "Front left" "Front right", but not the "Back left" or the "Back right". Even if I am playing with the 2 speaker option on my 5.1 speakers or with my headphones the same thing is happening. Then I double checked the drivers and all were updated. I think i'm running out of options
.