Shoutbox

You need to check your case for wires in it, they generally should be labeled such as "RSTBTN" or so.

After you've done that and identified which wire means what.  Refer to your manual (or http://dlsvr01.asus.com/pub/ASUS/mb/socket775/P5V...2260_p5v800-mx.pdf if you have lost it) into page 1-30.