[ 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(though "turbo" is now outdated and not generally seen on new PCs.)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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