Dell PP04S Owner's Manual page 105

Ground yourself and install the new memory module:
9
Align the notch in the module edge connector with the tab in the center of the
a
connector slot.
Slide the module firmly into the slot at a 45-degree angle, and rotate the module
b
down until it clicks into place. If the module does not click into place, remove the
module and reinstall it.
memory module
connector
Adding and Re placing Parts
105