Dell PowerEdge C6145 Hardware Owner's Manual page 112

Figure 3-19. Installing and Removing a DIMM
1 memory module
3 memory module socket ejector (2)
7 Press down on the memory module with your thumbs to lock the
memory module into the socket. See Figure 3-19.
When the memory module is properly seated in the socket, the ejectors
on the memory module socket align with the ejectors on the other
sockets that have memory modules installed.
8 Repeat step 4 through step 7 of this procedure to install the remaining
memory modules in the approved configurations. See Table 3-3.
9 Replace the system-board assembly. See "Installing a System-Board
Assembly" on page 88.
10 Start up the system. Press <F2> to enter the System Setup program.
Check the System Memory settings on the main System Setup screen.
The system should have already changed the value to reflect the newly
installed memory.
11 If the value is incorrect, one or more of the memory modules may not
be installed properly. Repeat step 2 through step 10 of this procedure,
to ensure that the memory modules are firmly seated in their sockets.
112 | Installing System Components
2 memory module socket