HP dx7400 - Microtower PC User Manual

9. Remove the eight screws that secure the system board to the chassis (1), slide the board about
1.25 cm (1/2 inch) toward the front of the chassis (2), and then lift the board out of the chassis (3).
To install the system board, reverse the removal procedure.
CAUTION: Before reinstalling the heatsink you must clean the top of the processor and the bottom of
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: When reconnecting the cables it is important that they be positioned so they do not interfere
with the rotation of the drive cage or power supply.
NOTE: When replacing the system board, you must also change the chassis serial number in the
BIOS.
114 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis

HP dx7400 - Microtower PC Specifications

General

Memory	Up to 8 GB DDR2 SDRAM
Audio	Integrated High Definition Audio
Power Supply	300W
Processor	Intel Core 2 Duo, Pentium Dual-Core, or Celeron
Storage	SATA Hard Drive
Optical Drive	DVD-ROM, DVD+/-RW
Graphics	Integrated Intel Graphics Media Accelerator 3100
Networking	Integrated Gigabit Ethernet
Expansion Slots	1 PCI Express x16
Ports	1 serial, 1 parallel, audio in/out
Operating System	Windows XP Professional