Ps3 to COmp

What model monitor is it?

"I would like to hook up a ps3 to my computer"

You mean your PS3 to your monitor.

If you do actually mean 'PS3 to my computer' - ie you want to record PS3 images onto the PC or something - you will need a video capture card, and a damn good one to work in HD smoothly.

no i do mean ps3 to computer b/c i assume ucan do that b/c i have the cabels that conect perfectly from my ps3 to comp
monitor model is.. acer AL1916W

...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)

For sound:
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