options
1) 1/8 inch minijack out from onboard or sound card to rca red and white composites on receiver most basic
2) (HDMI output) on video card to (HDMI input) in on receiver with (hdmi out) on receiver to (HDMI in) on monitor if available
or you can use (DVI out) from video card for video on monitor
3) (Toslink output) on sound card to (toslink input) on receiver if available (my favorite)
wow that is not easy to explain