System Board - HP dx7400 - Microtower PC Service & Reference Manual

5. Go to step 7.
6. If using a new heatsink, remove the protective covering from the bottom of the heatsink and place
it in position atop the processor.
7. 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:
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:
to ensure that the latest version of the BIOS is being used on the computer. The latest system ROM
BIOS can be found on the Web at: http:///\h18000.www1.hp.com/support/files.

System Board

1. Prepare the computer for disassembly
2. Remove the access panel
3. Remove the front bezel and lay the computer down on its side to make it easier to work on
Bezel on page
4. Disconnect the power, and data cables from the back of all installed drives.
5. Remove the system fan
6. Disconnect all cables from the system board.
7. Remove the heatsink from the system board
8. Remove the eight screws that secure the system board to the chassis (1).
80 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis
Heatsink retaining screws should be tightened in diagonally opposite pairs (as in an
After installing a new processor onto the system board, always update the system ROM
(Access Panel on page
58).
(System Fan on page
(Preparation for Disassembly on page
57).
77).
(Heatsink on page
56).
78).
(Front