Allow computer to cool down before continuing. 3 Unplug all external cables except power cord. 4 Touch metal PCI cover on back of computer. 5 Unplug power cord. Opening the Computer 1 Hold side access panel and lift latch on back of computer. Warning: Edges of access panel and enclosure can be sharp. Be careful when handling. 2 Remove access panel and place it on flat surface covered by soft, clean cloth. PCIe Fan Replacement Instructions Note: Follow these instructions carefully. Fail

Failure to follow these instructions could damage your equipment and void its warranty. Note: Online instructions are available at Tools Required • Use the enclosed tool, or a Phillips #2 screwdriver • Flat-blade screwdriver Part Location 034-3247 Rev A Important Things to Know 1. Don’t remove any screws other than the ones mentioned in this document. 2. Ground yourself when working on the computer. The procedure will show you how to ground yourself. 3. Keep drinks and other liquids away from th

073-1254 Rev. A 18 Disconnect 3 cables from logic board. 19 Using long-handled Phillips #1 screwdriver, loosen 6 captive screws. 20 Rotate computer to stand vertically. Using 2.5 mm hex driver, remove 5 mushroom- head screws. 21 To release 2 latches holding front fan to cage, press down on bottom of cage while using flatblade screwdriver to release latch from top of cage. 22 Slide fan partway into cage, so that fan clears enclosure. 23 Repeat steps 4 and 5 for rear fan. Note: Processor cage incl

© 2009 Apple Inc. All rights reserved. 073-1254 Rev. A Processor Tray 10 Locate processor tray. 11 Press down and release 2 latches on front of processor tray. © 2009 Apple Inc. All rights reserved. 073-1254 Rev. A 12 Holding tray by latches, lift it out of computer. 13 Place tray DIMM side up on soft, clean cloth. PCIe Fan 14 Locate PCIe fan. © 2009 Apple Inc. All rights reserved. 073-1254 Rev. A 15 Remove 2 screws. 16 Slide fan up and out of computer. Processor Cage 17 Locate processor cage. ©