HP Compaq Presario,Presario R4000 Maintenance And Service Manual page 214

Screw Listing
mm
2 screws that secure the system board to the top cover (documented in
Section 5.22)
Phillips PM1.5×8.0 Screw Locations
C–24
Table C-9
Phillips PM1.5×8.0 Screw
Color Qty.
Silver 2
Length Thread
8.0 mm 1.5 mm
Maintenance and Service Guide
Head
Width
2.0 mm