Hardware Secrets posted a step-by-step fully illustrated guide on how to replace your PC power supply with a new one.
O.k, so you are a complete layperson, has never open your computer case, is afraid of doing so, but want to replace your power supply unit with a better one. This tutorial was just made for you: a step-by-step guide on how to replace your power supply full of pictures, especially made for people who has never opened the PC case and/or is afraid of changing things inside the PC.How To Replace Your Power Supply Review
