HP ZE4900 - Manual (Page 127)

5–44 Maintenance and Service Guide
Removal and Replacement Procedures
✎
Step 7 applies only to HP Compaq nx9040 models.
7. Remove the 6 HM5.0×9.0 screwlocks on each side of the
parallel, serial, and external monitor ports.
Removing the System Board Screwlocks - HP Compaq nx9040
Notebook Models Only