[ The PC Guide | Systems and Components Reference Guide | System Case ]

System Case LEDs

Most cases have the following LEDs on the front panel, which vary greatly in style, shape and color but usually work the same way. "LED" stands for light-emitting diode, a low-power component that emits light when supplied with electricity. They are used extensively as status indicators in electronic devices and are described in more detail in the fundamentals page on electronic components.

LEDs on the front of a typical tower case; this model has them along the very
top edge of the case, but they can appear anywhere the designers choose.
These LEDs use the classic colors of green for power, red for hard disk
activity, and yellow for turbo. All three LEDs are lit (the power LED tends
to get "washed out" by the lighting used for these pictures.)

Next: Power LED

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