Dell Precision 450 - Manual (Page 126)

If you insert the module correctly, the securing clips snap into the cutouts at each end of the module.
When the memory module is properly seated in the socket, the securing clips on the memory module socket should align with the securing clips on the
other sockets with memory modules installed.
5. Close the computer cover .
6. Connect your computer and devices to electrical outlets, and turn them on.
The computer detects that the new memory does not match the existing configuration information and generates the following message:
The amount of system memory has changed.
Strike the F1 key to continue, F2 to run the setup utility
7. Press to enter system setup and check the value for System Memory.
The computer should have changed the value of System Memory to reflect the newly installed memory. Verify the new total. If it is correct, skip to step
10 .
8. If the memory total is incorrect, turn off and disconnect your computer and devices from electrical outlets.
9. Open the computer cover and check the installed memory modules to ensure that they are seated properly in their sockets. Then repeat steps step 4
through step 7 .
10. When the System Memory total is correct, press to exit system setup.
11. Run the Dell Diagnostics to verify that the memory modules are operating properly.
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NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.