TYAN S5550, Manual

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2.7 Tips on Installing Motherboard in Chassis
Before installing your motherboard, make sure your chassis has the necessary
motherboard support studs installed. These studs are usually metal and are gold in
color. Usually, the chassis manufacturer will pre-install the support studs. If you are
unsure of stud placement, simply lay the motherboard inside the chassis and align
the screw holes of the motherboard to the studs inside the case. If there are any
studs missing, you will know right away since the motherboard will not be able to be
securely installed.
Some chassis include plastic studs instead of metal. Although the plastic studs are
usable, MITAC recommends using metal studs with screws that will fasten the
motherboard more securely in place.
Below is a chart detailing what the most common motherboard studs look like and
how they should be installed.