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10. Reinstall the keyboard. See “Replacing the keyboard” on page 130.
11. Reinstall the battery. See “Replacing the battery” on page 119.
12. Turn the computer over again. Connect the ac power adapter and cables to the computer; then turn it on.
To make sure that the SO-DIMM is installed correctly, do as follows:
1. Turn the computer on.
2. When the logo screen is displayed, press F1. The ThinkPad Setup opens. The “Installed memory” item
shows the total amount of memory installed in your computer.
Increasing or replacing memory (W520)
Before you start, print these instructions.
Note: If your computer is a dual-core processor model, two Dummy DIMM cards (1) and (2) are preinstalled
in the topside and underside of your computer and do not replace the Dummy DIMM cards with SO-DIMMs.
On the top gure, the Dummy DIMM card is preinstalled in the lower slot under the keyboard.
Note: Your computer may look slightly different from what this illustration shows.
Chapter 6. Replacing devices 139