Software developers make their programs ever more graphical; interfaces become ever more slick. But underneath the buttons and sliders, PCs are electronic systems comprising power supplies, logic processors, and specialized circuitry for such functions as video and sound. When the machine grinds to a halt, someone has to know how to identify the problem and get it straightened out. That's the function of the CompTIA A+ certification, and this new edition of Mike Meyers' A+ Certification Passport will help you earn it. Meyers combines reams of detailed information about IBM-standard PCs (which is to say, those running Intel, AMD, and Cyrix) with rock-solid troubleshooting advice. Look here for electronic details of the IDE and SCSI interfaces, as well as strategies for figuring out whether a problem is in a drive or in its controlling electronics.

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