HP DC7800 - Manual (Page 165)

System Board
1. Prepare the computer for disassembly ( Preparation for Disassembly on page 107 ).
2. Remove the access panel ( Computer Access Panel on page 113 ).
3. Remove all PCI and PCI Express expansion boards ( Expansion Cards on page 120 ).
4. Remove the fan shroud from the chassis ( Fan Shroud on page 145 ).
5. Rotate the drive cage to its upright position.
6. Rotate the power supply to its full upright position.
7. Disconnect all data and power cables from the system board.
System Board 153