HP Pavilion zx5000 Maintenance And Service Manual page 132

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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
Maintenance and Service Guide
Removal and Replacement Procedures
5–25