Dell PP21L Owner's Manual page 90

4 If you are replacing a memory module, remove the existing module:
Use your fingertips to carefully spread apart the securing clips on each end of the memory module
a
connector until the module pops up.
Remove the module from the connector.
b
1 memory module
NOTICE:
If you need to install memory modules in two connectors, install a memory module in the connector
labeled "DIMMA" before you install a module in the connector labeled "DIMMB." Insert memory modules at a
45-degree angle to avoid damaging the connector.
NOTE:
If the memory module is not installed properly, the computer may not boot properly. No error message
indicates this failure.
5 Ground yourself and install the new memory module:
Align the notch in the module edge connector with the tab in the connector slot.
a
Slide the module firmly into the slot at a 45-degree angle, and rotate the module down until it
b
clicks into place. If you do not feel the click, remove the module and reinstall it.
90
Adding and Replacing Parts
1
2
2 securing clips (2 per
connector)