One thing to remember with the Power Tower AT power supply is that the on/off switch on the front runs at mains voltage. This is different from current ATX standards where the mains on/off switch is integral with the power pack itself. This is important if you start opening up the case and doing stuff with the unit plugged into the mains. The rear of the on/off switch has some clear plastic tubing over the connections, but it's just about touching the side panel. While this is probably OK, I was always a bit cautious of working inside with it plugged in. I know you shouldn't do that, but you do don't you.
EDIT:
Just spotted something about the connections. There's a power cable 5-pin adapter supplied with the kit. This fits into the mobo power socket. The other end has two plugs which need connecting to the sockets labelled P8 and P9 coming from the PSU. The important thing is P9 attaches to the connector from the mobo with only a black and a red wire to it.
Sorry for earlier confusion.
JaX
