168 Solving Problems
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•Memory modules must be installed in matched pairs. Ensure that the
modules installed in system board or memory riser board socket pairs
are identical. To identify system board socket pairs, see "System Board
Memory Components." To identify memory riser board socket pairs,
see "Memory Riser Board Components."
If the problem still exists after you complete the basic checks, fill out the
Diagnostics Checklist as you perform the following steps.
CAUTION: Before you perform this procedure, see "Safety First—
For You and Your Computer."
NOTICE: Before disconnecting a device from the computer, wait 10 to 20
seconds after disconnecting the computer from its electrical outlet. Before
removing a component from the system board, verify that the standby power
light on the system board has turned off. T o locate this light, see "System Board
Components" or the interior service label.
1Enter system setup and ensure that the value for System Memory
matches the actual amount of memory installed in the computer.
Does the memory total correctly match the actual amount of memory
installed in the computer?
Yes. The computer updated the memory count when you restarted the
computer. The problem is resolved.
No. Go to step 2.
2Run the System Memory test group in the Dell Diagnostics.
Did any of the diagnostics tests fa il?
Yes. Contact Dell for technical assistance.
No. Go to step 3.
3Turn off the computer and devices, disconnect them from their
electrical outlets, and wait 10 to 20 seconds.
4Lay the computer on its right side.
5Open the computer cover.
6If you have the optional memory riser boards installed, remove the
riser boards.
7Remove and install the memory module(s) in system board or riser
board sockets.