HP Compaq Presario,Presario 1500 Maintenance And Service Manual page 209

Where used:
1 One screw that secures the memory expansion compartment cover to the
base enclosure (documented in Section 5.5)
2 One screw that secures the mini PCI compartment cover to the base
enclosure (documented in Section 5.6)
Figure C-12. PM2.5 × 4.0 Screw Locations
Maintenance and Service Guide
Table C-4
Phillips Metric 2.5 × 4.0 Screw
Color
Silver
Qty Length
2 4.0 mm
Head
Thread Width
2.5 mm 5.0 mm
C–13