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

10. Slide the power supply about 1.25 cm (1/2-inch) toward the front of the chassis (2), rotate the power
supply toward the heatsink so it clears the lip at the top of the chassis (3), and then lift the power
supply out of the chassis (4).
To install the system board, reverse the removal procedure.
CAUTION:
the heatsink with an alcohol pad supplied in the spares kit. After the alcohol has evaporated, apply
thermal grease to the top of the processor from the syringe supplied in the spares kit.
NOTE: When reinstalling the system board it is important to secure the system board and tray to the
chassis with the long retaining screw before performing any subsequent steps.
CAUTION:
with the rotation of the drive cage or power supply.

System Board

1. Prepare the computer for disassembly
2. Remove the access panel
3. Remove all PCI and PCI Express expansion boards
4. Remove the optical drive
5. Remove all memory modules
6. Loosen the plastic cable fastener
7. Disconnect all data and power cables from the system board.
8. Remove the power supply
Before reinstalling the heatsink you must clean the top of the processor and the bottom of
When reconnecting the cables it is important that they be positioned so they do not interfere
(Access Panel on page
(Optical Drive on page
(Replacing Memory on page
(Power Supply on page
(Preparation for Disassembly on page
88).
(Expansion Card on page
95).
(Plastic Wire/Cable Fastener and Clips on page
112).
87).
101).
99).
System Board 113
105).