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

LEDs, Speaker and Connecting Wires

Most cases have at least two LEDs, to indicate power and hard disk activity. Some have several more LEDs to indicate turbo status or other functions (though "turbo" is now outdated and not generally seen on new PCs.) A standard PC speaker is usually mounted somewhere inside the case, but may be loose in a new case. There are special wires for all the LEDs and for the speaker, to be connected to the motherboard or drives. See this procedure for instructions on connecting the case and motherboard.

A pair of wires runs from each of the power, hard disk and turbo LEDs (at left)
down to connectors on the motherboard. The black and red wires at the bottom
right go to the PC speaker. This PC has obviously been assembled with
some care: the wires are bundled and routed neatly, avoiding the
(unfortunately very common) tangle of wires found in many PCs.

Next: Cooling Vents and Auxiliary Fans

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