Acer 5600 series - Manual (Page 81)

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Note: Make sure that the other ends of the disk cables are
securely connected to their corresponding connectors on the
mainboard.
8 Reinstall the metal bracket frame to the housing.
9 Replace the computer cover.
Installing an expansion card
To install an expansion card:
1 Remove the computer cover.
2 Locate an empty PCI slot on the mainboard.
3 Remove the screw that holds the bracket to the computer. Save
the screw.