For more than 20 years, Scott Mueller's Upgrading and Repairing PCs has been the definitive guide to the inner workings of the latest PCs: with nearly 2,500,000 copies sold, it's the best-selling hardware guide ever. Professional technicians and PC enthusiasts alike rely on Mueller for accurate, up-to-date, and clear information for troubleshooting problems, improving system performance, and making the most of today's best new hardware. The brand-new 20th edition of Upgrading and Repairing PCsis better than ever. Mueller's beefed up coverage of the latest hardware innovations and repair techniques, and presents two full hours of DVD video - including a step-by-step video guide to building new PCs from scratch. As always, Mueller presents comprehensive, trustworthy coverage of every PC component: processors, motherboards, buses, BIOS, memory, disk storage, video, audio, I/O, input devices, networking, power supplies, and more. He also presents authoritative coverage of overclocking, cooling, PC diagnostics, testing, and maintenance.