HP PL Class 450/500/550/600/650/700/750 User Manual page 47

How to Install Accessories In Your HP Visualize Linux Workstation
9. Firmly press the memory module completely into the connector until
the retaining clips click into position.
10. Repeat this procedure for each additional memory module you want
to install.
11. Install any other accessories if necessary, then replace all units
and reconnect all cables and power cords. Replace the cover (see
page 24).
12. Check the HP Summary Screen to verify the new configuration (refer
to the section "The HP Summary Screen and Setup Program" in the
chapter "Technical Information").
Chapter 2
Installing Memory
31