Lenovo ThinkPad T420si (English) User Guide - Page 111
With the notched end of the SO-DIMM toward the contact edge side of the socket, insert the SO-DIMM
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6. With the notched end of the SO-DIMM toward the contact edge side of the socket, insert the SO-DIMM into the socket at an angle of about 20 degrees (1); then press it in firmly (2). Note: If you install a memory module in only one of the two memory slots, install it in the lower slot. 7. Pivot the SO-DIMM downward until it snaps into place. 8. Make sure that the SO-DIMM is firmly fixed in the slot and cannot be moved easily. 9. Put the memory slot cover back in place (1), close the cover (2), and tighten the screws (3). 10. Put the battery back in place, turn the computer over again, and reconnect the cables. For information about how to replace the battery, refer to "Replacing the battery" on page 97. To make sure that the SO-DIMM is installed correctly, do as follows: 1. Turn the computer on. Chapter 6. Replacing devices 95