Ways and means of basic trouble shooting
PC's are actually much easier to repair these days than in the early 90's when I wrote the my old guide for technicians i was training. the number of discrete parts in a PC has dropped radically since i first cracked open an PC AT 1985. the average PC these days has less than a dozen parts, unless you start counting cables, and that total includes the keyboard and mouse! So, some new tech figure the way to learn computer repair and hardware trouble shooting is to carry around a few spare parts and swap-til-you-drop.