Acer AcerSystem (User Guide) - Manual (Page 23)

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2 Align the memory DIMM with the socket (a). Press the memory DIMM into
the socket until the clips lock onto the memory DIMM (b).
Note: The memory DIMM sockets are slotted to ensure proper
installation. If you insert a memory DIMM but it does not fit easily
into the socket, turn the memory DIMM around and try to insert it
again.
To reconfigure your computer
Your computer automatically detects the amount of memory installed. Run the
BIOS utility to view the new value for total system memory and make a note of
it.
Replacing the hard disk
Follow these steps to replace your computer's hard disk:
1
Remove the computer cover.
2 Detach all cables connected to the hard disk and pull the hard disk out.
3 Remove the drive rails that hold the hard disk to the disk frame and detach
the hard disk. Set the drive rails aside.
4 Insert the new hard disk into the frame and secure it with drive rails.
5 Reattach all cables to the new hard disk.
Note: Make sure that the other ends of the disk cables are securely
connected to their corresponding connectors on the mainboard.