HP ProBook 4310s Maintenance And Service Manual page 94

Removal and replacement procedures
6. Remove the two Torx T8M2.5×6.0 screws 1 that secure the system board to the base enclosure.
7. Loosen the Phillips PM2.0×9.0 captive screw 2 that secures the fan and system board to the base enclosure.
8. Use the optical drive connector 1 to lift the left side of the system board 2 until it rests at an angle.
9. Remove the system board 3 by sliding it away from the base enclosure at an angle.
Reverse this procedure to install the system board.
Maintenance and Service Guide 4–49