How to Build Your Own
Pentium III Computer
Install the Motherboard
Last updated: 4/14/99
are six mounting holes on the motherboard: three at the front and three
at the back. There more than six holes where you can screw-in
the brass standoffs (the HX45 Assembly Instructions calls them studs) used to
secure the motherboard to the case and more than six standoffs come with
the case. Set the motherboard with the anti-static bag on top of the
side of the case. Use it as visual guide to screw six standoffs to
the case. Screw-in the standoffs by hand and then use a socket driver
to tighten them (you could use an adjustable wrench or pliers if you are
Do not over-tighten. What remains can be very
difficult to remove when they break. Count them to verify there
place the motherboard in the case so the mounting holes are centered over
their respective stand-offs.
Don't force the motherboard into the case--wiggle
it into place if you have to. If you see a mounting hole without
a stand-off, you didn't install six of them or, worse, one of them is
in the wrong hole and under the motherboard where it will short-it-out. I've
done it more than once. It is a very common mistake.
the back of the computer to see if the I/O connectors are aligned with their
respective cutouts and that all of the appropriate blanks have been completely
removed. If necessary, loosen the screw on the I/O panel and adjust
the motherboard to the standoffs with six 6# -32*6L screws.
Other cases use a smaller screw. I usually check
alignment and screw-in one screw at the center of the rear of the board,
check alignment again, and screw-in another at the front, followed by
the remainder. Do not over-tighten these screws or you could damage
that you have secured the motherboard with six screws and that all of them
properly seated (not cross-threaded).
Besides securing the motherboard to the case, most
or all--I can't see all four layers of the board--of these screws electrically
ground the board to the case.
the rubber band from the front panel cables.
the front panel cable labeled "POWER SW" to connector labeled "POWER-ON" on
the motherboard (front of the motherboard, second row back, second pair of
pins from the left).
Front panel connectors for this motherboard are installed
with the label on the connector facing towards the back of the case.
the front panel connector labeled "SPEAKER" to the motherboard
connector labeled "SPEAKER."
It is important to connect the speaker now so you
can hear any BIOS error beeps when you first power-up the computer. I
do not install the rest of the front panel connectors until I'm sure
I do not have to remove the motherboard.
the rubber band from the power supply connectors, untangle them and connect
the ATX motherboard power plug to the socket on the motherboard behind
the CPU with clip facing towards the back of the case. Push it down
until it snaps into place. It will only connect one-way.
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