Dell Inspiron 640M Owner's Manual page 117

1
1 memory module
NOTICE:
If you need to install memory modules in two connectors, install a memory module in the connector
labeled "DIMM A" before you install a module in the connector labeled "DIMM B." 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.
2
2 securing clips
(2 per connector)
Adding and Replacing Parts
117