Dell Latitude 120L - Manual (Page 12)

1. Align the pin-1 corner of the processor module so that it points to the triangle on the system board, and insert the processor module into the ZIF socket.
When the processor module is correctly seated, all four corners are aligned at the same height. If one or more corners of the module are higher than the
others, the module is not seated correctly.
2. Tighten the ZIF socket by turning the cam screw clockwise to secure the processor module to the system board.
3. Wipe the thermal grease off of the processor thermal-cooling assembly with a clean paper towel.
4. Replace the processor thermal-cooling assembly. See Replacing the Processor Thermal-Cooling Assembly .
5. Update the BIOS using a flash BIOS-update program CD. See Flashing the BIOS From a CD .
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NOTICE: Hold the processor down while turning the cam screw to prevent intermittent contact between the cam screw and processor.