Dell XPS 8500 (Early 2012) - Manual (Page 117)

Replacing the System Board
1 Gently place the system board into the chassis and slide it towards the
back of the computer.
2 Replace the screws that secure the system board to the chassis.
3 Route and connect the cables that you disconnected from the system
board.
NOTE: For information on system board connectors, see "System-Board
Components" on page 21.
Postrequisites
1 Replace the processor. See "Replacing the Processor" on page 103.
2 Replace the processor fan and heat-sink assembly. See "Replacing the
Processor Fan and Heat-Sink Assembly" on page 99.
3 Replace the graphics card. See "Replacing the Graphics Card" on page 39.
4 Replace any PCI-Express x1 card(s), if applicable. See "Replacing the PCI-
Express x1 Card(s)" on page 46.
5 Replace the memory module(s). See "Replacing Memory Module(s)" on
page 28.
6 Replace the Mini-Card, if applicable. See "Replacing the Mini-Card" on
page 51.
7 Replace the computer cover. See "Replacing the Computer Cover" on
page 25.
8 Follow the steps in "After Working Inside Your Computer" on page 15.
Entering the Service Tag in BIOS
1 Turn on the computer.
2 Press <F2> during POST to enter the system setup program.
3 Navigate to the main tab and enter the service tag in the Service Tag
Setting field.
NOTE: Set Service Tag field allows you to enter the service tag manually only when
the service tag is absent.
System-Board 117