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Well, think about what we mean when we say an electronics component 'fries' - sometimes it's a bad capacitor (or multiple bad caps, since there's often redundancy). Sometimes it's some sort of physical fatigue - like a broken connection between a chip and the board. Often it's because a chip or other part overheats, and essentially melts and burns. Just like a fuse in your car, any electrical circuit gets hotter the more juice you put through it. When it gets too hot, it melts, and blam, dead. Same thing happens in a microprocessor - maybe the power supply puts out too much voltage, or a surge comes through the power supply, or phone/ethernet line. Or the pathways in the cpu itself degrade, or the thing gets too hot because of a cooling issue (fan goes out, etc).
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