...why do i have the feeling he's trying to put the AV cables in the onbaord sound slots...
You can do 1 of two things for video:
1: Video capture card
2: Plug directly into moniter (need HDMI input/output for Moniter/PS3)
1: If moniter has internal speakers, the above mentions HDMI connection *should* give sound as well
2: Plug sound outputs into sound slots on PC? (never tried, would it work?)
3: Connect to sound card via optical cable