Dell Latitude C800 - Manual (Page 62)

Memory modules are keyed, or designed to fit into their sockets in only one direction. The slots on the system board are notched so
that the memory module can be firmly seated only one way.
7. If you do not hear a click as each end of the memory module snaps into the metal tabs, remove the memory module and reinstall it.
NOTICE: If the memory module cover does not fit or is difficult to close after installation, you may have installed the memory module
improperly or into the wrong slots. Remove the memory module and reinstall it. Do not force the memory module cover to close
because you may damage your computer.
8. Replace the memory module cover. Be careful not to over tighten the screw.
9. Reconnect your computer and devices to their electrical outlets and turn them on.
As the computer boots, it detects the presence of additional memory and automatically updates the system configuration information.
Verify that the correct memory total is displayed. If necessary, repeat steps 1 through 8 until the memory total is correct.
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