Hooking up the power:
Today's case, power supply and motherboards are what's known as the ATX form factor.
I only mention this in case some on finds a really good buy on a part from a supplier that's getting rid of old AT form factor parts.
AT and ATX are not interchangeable.
If you see a really great buy and it says AT form factor don't buy it unless your replacing parts in a old AT style computer.
The motherboard, power supply and case are the only parts affected by this.