Dell Dimension 4600 - Manual (Page 14)

If the module is difficult to remove, gently ease the module back and forth to remove it from the connector.
4. To insert a module, press out the securing clip at each end of the memory module connector.
5. Align the notch on the bottom of the module with the crossbar in the connector.
6. Insert the module straight down into the connector, ensuring that it fits into the vertical guides at each end of the connector. Press firmly on the ends
of the module until it snaps into place.
If you insert the module correctly, the securing clips snap into the cutouts at each end of the module.
7. Replace the computer cover .
8. Connect your computer and devices to electrical outlets, and then turn them on.
9. Click the Start button, right-click My Computer, and then click Properties.
10. Click the General tab.
11. To verify that the memory is installed correctly, check the amount of memory (RAM) listed.
Front Panel
NOTICE: To avoid breaking the memory module, do not press near the middle of the module.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.