I just got a logitech z-680 5.1 sound system I have it connected to my msi z87-g41 onboard sound device which is a realtek hd audio all drivers are up to date.I have it wired 6 channel mode everything seems to work fine when i do the sound test sound comes out of every speaker as it should but when i try to listen to anything i.e. music movie games I get no sound from my center speaker at all i even tried doing a 5.1 test video on you tube.this is really bothering me i have been at this for days trying to fix it.Before I got the z-680 I had it hookeds up to a stereo receiver the exact same way with 6 channel mode and had the same issue that i'm having now.when i go back to the realtek audio manager and click the center speaker it works. I dont know what to do. I went to my local pc shop and was gonna get a usb sound card but they were out of stock. Any ideas on what i could try to get the center speaker working?? Thanks