IBM Power System Series Manual page 195

Attention: Memory modules are keyed to prevent a memory module from being installed
incorrectly. Note the location of the key tab within the memory module connector before you
attempt to install the memory module.
5. Ensure that the locking tabs of the memory module are open. Slowly press the memory module
straight down, firmly into the slot, until the locking tabs lock into place. See Figure 167 on page 191.
Figure 167: Installing memory modules in a memory riser
6. Repeat steps "2" on page 190 through "5" on page 191 for each memory module.
Preparing the 9040-MR9 system for operation after installing memory modules
To prepare the system for operation after you install memory modules, complete the steps in this
procedure.
1. Ensure that you have the electrostatic discharge (ESD) wrist strap on and that the ESD clip is plugged
into a ground jack or connected to an unpainted metal surface. If not, do so now.
2. To insert the memory riser, complete the following steps:
a) Ensure the release latches (A) are fully open to a 90 degree angle as shown in the following figure.
b) Align the memory riser with the connector.
c) Press the memory riser firmly into the connector.
d) Rotate the release latches into the closed position, and press the release latches down to ensure
that the memory riser is fully seated into the connector.
Memory modules and memory risers for the 9040-MR9 191