Having Problems finding harddrive

I built my first computer and having two problems I hope someone can help me with. I have a primary and slave set up. System was working until I loaded Sevice Pack 2

1. Computer does not detect my harddrives and after the detection
screen i get a message that says "detecting array". I pressed F9 to
access Setup and the see that the HDs are not showing up.

2. As soon as the Windows screen starts I lose all power to the
keyboard and mouse

System Components
MOBO - K8N Pro SLI
AMD 64 X2 4800
XP Pro