1. Remove the two power supply screws circled below.

2. Open the optical drive door as shown. Support the metal plate and power supply as you remove the four screws.

Important: The two screws near the door hinge are shorter than the other power supply screws. Failure to replace the shorter screws into their correct location will scratch the top housing. See step 4, Replacement Note.

Remove the power supply from the chassis (Faraday cage).

Remove the power supply from the chassis (Faraday cage).

4. Replacement Note: When replacing the metal plate (see picture above) that sits on top of the power supply, make certain that the two shorter screws are inserted into the screw holes near the optical door. If the longer screws are inserted by mistake, the screws will scratch the top housing (circled below).

Warning: Whenever the bottom housing is opened for service, you must do two things:

  1. You must clean the original thermal film from the surfaces joining the thermal interface layer and reapply thermal paste to the thermal pipe.
  2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs. If you do not have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT NOT FORCIBLY. Or, purchase the service tool (076-0899) in order to ensure the thermal pipe is firmly mated with the top base. If the bottom housing is not securely attached to the base in this fashion, the CPU may overheat and become damaged. Failure to follow either of these steps could cause the computer to overheat and damage internal components.

Refer to the topic, "Thermal Paste Application" for detailed information.

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