HP zx5000 - Manual (Page 132)

Removal and Replacement Procedures
Maintenance and Service Guide 5–25
✎
Step 9 applies only to notebook models with a Mobile Intel
Pentium 4 or Intel Pentium 4 processor.
9. Use a flat-bladed screwdriver to turn the processor lock screw
one-quarter turn counterclockwise to release the processor
from the socket.
Releasing the Processor on HP Compaq Business Notebook
nx9100 Series and Compaq Presario R3000 Notebook Models