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5. If using a new heatsink, remove the protective covering from the bottom of the heatsink and place
it in position atop the processor.
6. Secure the heatsink to the system board and system board tray with the 4 captive screws and
attach the heatsink control cable to the system board.
CAUTION: Heatsink retaining screws should be tightened in diagonally opposite pairs (as in an
X) to evenly seat the heatsink on the processor. This is especially important as the pins on the
socket are very fragile and any damage to them may require replacing the system board.
NOTE: After installing a new processor onto the system board, always update the system ROM to
ensure that the latest version of the BIOS is being used on the computer. The latest system BIOS can
be found on the Web at:
http://h18000.www1.hp.com/support/files.
System Board
CAUTION: Be very careful when removing or replacing the system board to prevent damaging it.
1. Prepare the computer for disassembly (Preparation for Disassembly on page 159).
2. Remove the computer access panel (
Computer Access Panel on page 163).
3. Remove the optical drive (
Removing the Optical Drive on page 170).
4. Remove the memory modules (
Memory on page 166).
5. Remove the hard drive (
Hard Drive on page 174).
6. Remove the hard drive cage (
Hard Drive Cage on page 178).
7. Remove the front I/O panel (
I/O Panel on page 183).
8. Remove the heatsink (
Heatsink on page 184).
9. Disconnect all cables connected to the system board, noting their location for reinstallation.
10. Remove the five remaining screws that secure the system board to the chassis (1).
11. Slide system board toward the front of the unit until the rear connectors are clear of their slots in
the chassis (2).
System Board 187