Loosen the screw on the memory slot cover, then remove the cover.
If a SO-DIMM is already in the memory slot, remove it to make room for the new one by pressing out on the latches on both edges of the socket at the same time.
Find the notch on the side of the SO-DIMM. With the notched end of the SO-DIMM toward the right side of the socket, insert the SO-DIMM into the socket at an angle of about 20 degrees; then press it firmly. Note: To avoid damaging the SO-DIMM, do not touch its contact edge.
Pivot the SO-DIMM downward until it snaps into place.
Make sure that the card is firmly fixed in the slot and does not move easily.
Replace the memory slot cover by aligning the back side of the cover first; then tighten the screw. Note: When you have added or upgraded a memory card, do not use your computer until you have closed the cover. Never use the computer with the cover open.
Put the battery back in place, turn the computer over again, and reconnect the cables.
To make sure that the SO-DIMM is installed correctly, do as follows:
Turn the computer on.
While the Press F1 for BIOS Setup Utility message is displayed at the lower-left of the screen, press the F1 key. The BIOS Setup Utility screen appears. The Installed memory item shows the total amount of memory installed in your computer. For example, if your computer has 256MB of memory and you install a 256MB SO-DIMM in it, the quantity shown in Installed memory should be 512MB.