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[ The PC Guide | Systems and Components Reference Guide | Power | External Power | External Power Problems ]


A blackout, of course, is when the power totally fails. The damage that a blackout causes to your system depends a great deal on its timing. If the system is idle when the power goes out, probably nothing will be wrong with the system when the power comes back on. However, if the power goes while you are fixing problems on your hard disk, just as the drive was updating your file allocation tables, you're more likely to have trouble!

In addition, the power often doesn't go out cleanly, but with spikes and jitters both when it ends and when it comes back on. Most systems survive the power going off and back on without too much difficulty, but the potential for large amounts of damage is there; and of course, you lose any unsaved work that was in memory when the power went out.

Next: Protection Against Power Problems

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