Compaq Prolinea Family Maintenance & Serice Manual page 120

If a replacement battery has been installed in the computer, do not
disconnect the battery cable. Release the battery from the rear panel of
the base pan and remove the system board with the battery connected to the
board.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
NOTE: Before removing the system board, observe the relationship between
the ends of the system board bracket and base pan. You can use
this as an aid in determining that the board is properly seated at
replacement.
3. Disconnect any option card cables that are connected to the system
board.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Remove the system board slowly. Pull it out far enough to allow any cables
to be disconnected.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
4. Grasp the system board bracket at the ends (Figure 5-40) and slide the
system board and bracket out the side of the chassis.