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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. To 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 fail?
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.