How to Replace a Power Supply (and buy a good one)

Once upon a time there lived a PC who killed video cards. He was a
nice, quiet PC, middle aged and had always performed his duties well. At
some point he changed though. He went through several video cards
without regard to brand or price and eventually a lengthy investigation
uncovered the defect in him responsible. It was his power supply. This
guide shows you how to replace your power supply and what factors to
look for when buying..