Essential tools for building, repairing, and upgrading PCs (and other electronic devices)

There's an old saying apropos to building a new PC or upgrading an old one: "Use the right tool for the right job." Sure, you could use a butter knife to loosen a screw, or a pair of pliers to tighten a motherboard stand-off, but it won't make the job go any smoother, and you can bet it might do some harm. Using the right tool for any given job simply makes the job easier, and it usually improves the ultimate quality of the finished product. Every system builder needs a number of tools to comple...