Acer Altos G540 M2 - Manual (Page 93)

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(2) Gently pull the DIMM upward to remove it from the socket.
5 If you intend to install a new DDR3 Registered/Unbufferred DIMM,
proceed to the next section for related procedure, otherwise
reinstall the air duct, then observe the post-installation
instructions described on page 42.
To install an DDR3 Registered/Unbufferred DIMM:
1 Perform steps 1 through 3 of the previous section.
2 Select an empty DDR3 Registered/Unbufferred DIMM slot.
3 If necessary, open the holding clips of the selected DDR3
Registered/Unbufferred DIMM slot.
4 Remove the new DDR3 Registered/Unbufferred DIMM from its
protective packaging, handling it by the edges.
5 Install the DDR3 Registered/Unbufferred DIMM.
(1) Align the DDR3 Registered/Unbufferred DIMM so that the
notch on the slot fits the keyed edge of the module, then
press the module at both ends to seat it fully into the slot.
If you insert an DDR3 Registered/Unbufferred DIMM but it
does not fit easily into the slot, you have inserted it incorrectly.
Reverse the orientation of the module and insert it again.