Hardware Reference
In-Depth Information
Note
Many power supplies feature a 115/230V switch on the back. If this is improperly set, the
system won't power up. Refer to Chapter 18 for detailed coverage of power supplies and the
varioustypesofpowersupplyconnectors,includingthenewer24-pinATX2.xandeight-pin
ATX 12V types.
Connecting I/O and Other Cables to the Motherboard
Youmustmake several connections between themotherboard andthecase. These include
LEDs for the hard disk and power, an internal speaker connection, a reset button, and a
power button. Most modern motherboards also have several built-in I/O ports that have
to be connected. This includes ATA/SATA host adapters, a floppy controller, and front-
mounted USB or IEEE 1394 ports. Some boards also include additional items such as
built-in video, sound, or SCSI adapters.
If the board is an ATX or BTX type, the connectors for all the external I/O ports are
already built in to the rear of the board.
Use the following procedure to connect the cables needed for onboard I/O:
1. If your system uses an internal floppy drive, connect the floppy cable between the
floppy drives and the 34-pin floppy controller connector on the motherboard.
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