Dell Precision T7400 User's Guide - Page 158

11 Pivot the socket release lever back toward the socket and snap it into place to secure the processor. 12 Clean the thermal grease from the bottom of the heat sink. 13 Apply the new thermal grease to the top of the processor. NOTICE: If you are not installing a processor upgrade kit from Dell, reuse the original heat-sink assembly when you replace the processor. If you installed a processor replacement kit from Dell, return the original heat-sink assembly and processor to Dell in the same package in which your replacement kit was sent. 14 Install the heat-sink assembly: a Place the heat-sink assembly back onto the heat-sink assembly bracket. b Rotate the heat-sink assembly down towards the computer base and tighten the four captive screws. NOTICE: Ensure that the heat-sink assembly is correctly seated and secure. 158 Adding and Replacing Parts