HP ProOne 400 G1 Maintenance & Service Manual page 77

6.
To install a memory module, slide the SODIMM into the socket at approximately a 30° angle (1),
then press the SODIMM down (2) so that the latches lock it in place.
NOTE: A memory module can be installed in only one way. Match the notch on the module with
the tab on the memory socket.
7. Reassemble the computer.
Memory
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