Sorry I didn't reply. Its just that I was trying to gather some info, and I couldn't respond. The motherboard is properly installed. As for the PSU, the LED that is supposed to glow green isn't glowing. It think that is merely because we didn't bother connecting it. As for the AUX 4/8 pin plug. I must make a confession and this is why it took me so long to respond. I think I know which plug you are talking about but I am not sure. I know that probably makes me seem stupid, but I am really inexperienced so thats really my only excuse. I think I what plug that is, and in fact have been thinking that it needed to be plugged in but wasn't sure because I could find it mentioned in the manual. Next to it is says ATX v 12. That wouldn't happen to be it would it?