hear audio through tv via laptop

I need to know exactly which holes to plug the 3.5mm mini stereo to 2 rca cable into, in order to hear my laptop through the computer.

what size screw is used to secure base to my tv?

model# PN50A400C2D plasma tv. we moved and cannot locate the screws so i need to get replacement screws for the base. thanks

why is there a black line through my tv?

A thin black line has developed in my TV. It goes accross the whole screen, and is very hard to enjoy watching tv now. HELP!!!