i have a basic little computer assembly guide that is designed to help people building their first or second computer avoid the "it doesnt work, now what do i do?" situation. its for "after" you have bought everything and are ready to put it together.
it offers a very basic troubleshooting assembly guide to be sure things are working right.
if anyone thinks it can help them you can find it here:
http://forums.techpowerup.com/showthread.php?t=30165