Hi Tech Legion posted a guide about how to assemble a custom PC

Back in December I figured out what my new year's resolution was going to be... I'm giving up pre-built computer systems! Oh those packaged Dells, Gateways and HPs certainly have their place. They're great if you're a complete novice, or if your computing needs are quite modest. But they can be very limiting in terms of expansion and customization. A much better choice is to build your own custom computer, which despite what one might at first think, is not rocket science.

How to Assemble a Custom PC