HP Compaq Pro 4300 Maintenance And Service Manual page 82

5. Loosen the four captive screws that secure the heat sink to the system board tray.
CAUTION: Heat sink retaining screws should be removed in diagonally opposite pairs (as in
an X) to even the downward forces on the processor. This is especially important as the pins on
the socket are very fragile and any damage to them may require replacing the system board.
Figure 7-47 Removing the heat sink screws
74 Chapter 7 Removal and Replacement Procedures Small Form Factor (SFF) Chassis