HP Compaq NW8240 Maintenance And Service Manual page 163

4. Lift the rear edge of the system board 1 until it rests at
an angle.
5. Slide the system board 2 back until the front-right section of
the system board 3 is clear of the screw boss 4 on the system
board frame.
6. Remove the system board 5 from the system board frame.
Removing the System Board from the System Board Frame
Maintenance and Service Guide
Removal and Replacement Procedures
6–61