Dell OptiPlex 755 User's Guide - Page 213

Processor CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis. Removing the Processor 1 Follow the procedures in "Before You Begin" on page 21. 2 Remove the computer cover (see "Removing the Computer Cover" on page 168). 3 Loosen the captive screw on each side of the heat sink assembly. CAUTION: Despite having a plastic shield, the heat sink assembly may be very hot during normal operation. Be sure that it has had sufficient time to cool before you touch it. 4 Rotate the heat sink assembly upward, and remove the assembly from the computer. Lay the heat sink down on its top, with the thermal grease facing upward. 1 2 1 heat sink assembly 2 captive screws in housing (2) NOTICE: Unless a new heat sink is required for the new processor, reuse the original heat sink assembly when you replace the processor. Processor 213