HP Vectra VEi8 Supplementary Manual page 24

NOTE
Replacing the System Board
5 Install the new system board. To do this, align the rear connectors on
the new system board with the holes on the inside back panel. Lower
the board onto the 2 location pins, then replace the screws that hold
it in place.
6 Replace the main memory, processor and any accessory boards in
the new system board (described in this chapter). Reconnect any
cables you disconnected earlier and replace the drive tray.
7 Replace the cover (described in this chapter).
If you change your processor or system board, you may need to update
your BIOS. The latest BIOS for your PC and instructions on updating the
BIOS are available from:
www.hp.com/go/vectrasupport
.