Dell OptiPlex SX260 - Manual (Page 82)

The computer should have changed the value of System Memory to reflect the newly installed memory. Verify the new total. If it is correct, skip to
step 12 .
11. If the memory total is incorrect, turn off and disconnect your computer from the power adapter and devices from their electrical outlets. Remove the
computer cover and check the installed memory modules to ensure that they are seated properly in their sockets. Then repeat steps 4 through 9.
12. When the System Memory total is correct, press <Esc> to exit system setup.
13. Run the Dell Diagnostics to verify that the memory modules are operating properly.
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