HP dx2420 Service Reference Guide: HP Compaq dx2420 Business PC - Page 70

System Board

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To install the power supply, reverse the removal procedure. System Board 1. Prepare the computer for disassembly (Preparation for Disassembly on page 28). 2. Remove the computer access panel (Computer Access Panel on page 32). 3. Remove all expansion boards (Expansion Cards on page 40). 4. Disconnect all cables connected to the system board, noting their location for reinstallation. 5. Remove the heat sink (Heat sink on page 60). 6. Remove the remaining six screws that secure the system board to the chassis. Figure 6-43 Removing the system board 7. Slide the system board toward the front of the computer to disengage the I/O panel from the rear of the chassis. 8. Lift the system board out of the computer. When reinstalling the system board, first insert the I/O panel back into the slots in the rear of the chassis, and then align the board with the chassis screw holes. NOTE: When replacing the system board, you must change the chassis serial number in the BIOS. 64 Chapter 6 Removal and Replacement Procedures Microtower (MT) Chassis

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To install the power supply, reverse the removal procedure.
System Board
1.
Prepare the computer for disassembly (
Preparation for Disassembly
on page
28
).
2.
Remove the computer access panel (
Computer Access Panel
on page
32
).
3.
Remove all expansion boards (
Expansion Cards
on page
40
).
4.
Disconnect all cables connected to the system board, noting their location for reinstallation.
5.
Remove the heat sink (
Heat sink
on page
60
).
6.
Remove the remaining six screws that secure the system board to the chassis.
Figure 6-43
Removing the system board
7.
Slide the system board toward the front of the computer to disengage the I/O panel from the rear
of the chassis.
8.
Lift the system board out of the computer.
When reinstalling the system board, first insert the I/O panel back into the slots in the rear of the chassis,
and then align the board with the chassis screw holes.
NOTE:
When replacing the system board, you must change the chassis serial number in the BIOS.
64
Chapter 6
Removal and Replacement Procedures Microtower (MT) Chassis