Dell Inspiron 9100 Service Manual page 11

Memory Module, Mini PCI Card, and Devices: Dell Inspiron XPS and Inspiron 9100 Service Manual
NOTICE: Ensure that memory modules are installed in both connectors and
that they are of the same capacity. 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.
4. Ground yourself and install the new memory module:
a. Align the notch in the module edge connector with the tab in the connector
slot.
b. Slide the module firmly into the slot at a 45-degree angle, and rotate the
module down until it clicks into place. If you do not feel the click, remove
the module and reinstall it.
NOTE: If the memory module is not installed properly, the computer does not
boot. No error message indicates this failure.
5. Replace the cover and screw.
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