Asus Motherboard P5PL2 - Manual (Page 22)

2-2 Chapter 2: Hardware information
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P5PL2
2.2 Motherboard overview
Before you install the motherboard, study the configuration of your chassis
to ensure that the motherboard fits into it.
Make sure to unplug the power cord before installing or removing the
motherboard. Failure to do so can cause you physical injury and damage
motherboard components.
Do not overtighten the screws! Doing so can damage the motherboard.
2.2.1 Placement direction
When installing the motherboard, make sure that you place it into the
chassis in the correct orientation. The edge with external ports goes to the
rear part of the chassis as indicated in the image below.
2.2.2 Screw holes
Place seven (7) screws into the holes indicated by circles to secure the
motherboard to the chassis.
Place this side towards
the rear of the chassis