The Outside Story of Typical Computers
Although the “inside” story of computers is even more complicated than the outside, don't neglect taking a good look at the outside of your system when it's time to troubleshoot a computer problem. You also need to check out the outside of the computer when it's time to plug in a peripheral to see if there's a suitable connector for it.
The outside of the computer is where you'll find
Cable connections for external peripherals such as cable modems, printers, monitors, and scanners
Drive bays for removable-media and optical drives
The power supply fan and voltage switch
The power cord between the computer and the wall outlet (and between external peripherals such as monitors and printers and the wall outlet) ...
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