Yes, sorry, that was doubtless confusing. I have had a few cases where people were using the front panel line out and only getting stereo. This doesn't happen if you have a sound card of course, as you plug in to the sound card. But if you remove the sound card, then you are back to on board HD audio, and if you use the wrong line out you will only get stereo no matter what else you do!
Can you actually use the audio manager? Can you change the settings to 5.1 for instance? ( As in the screen shot I posted).
If you can change the settings but still only get stereo when you press the test button, then you are using the wrong line out.
If you "mouse-over" the jacks on your audio manager an info tip should pop up telling you what it is. Apart from that, you need to check the boxes on the left to set up your speakers after you have chosen the scheme you want, ( 5.1 is shown in the screen shot ).
Regards....Mike Connor