Dell Vostro 1400 (Mid 2007) - Manual (Page 13)

1. Follow the instructions in Before You Begin .
2. Follow the instructions in Replacing the Microprocessor Module .
3. Align the four captive screws on the new microprocessor thermal-cooling assembly with the screw holes on the system board.
4. Tighten the four captive screws in the order that they are numbered to secure the microprocessor thermal-cooling assembly to the system board.
5. Replace the microprocessor module cover.
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NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal
surface, such as the back panel on the computer.