Seating the Motherboard
Remove both side panels of the 500R PC case such that the interior frame is completely exposed. Lay the PC case on its right side so it’s easier to position the motherboard inside it (per the following figure).
Before placing the motherboard inside the PC case, attach the plastic I/O port cover plate that accompanied the motherboard to the knocked-out I/O shield area in the upper-left side of the PC case, as Figure 15, Snap the MOBO's I/O cover plate into this opening shows.
Check the orientation ...
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