HP J Class Owner's Manual page 174

Disconnect fan cable
from system board.
Figure A–27. Removing CPU Shroud and Disconnecting Fan Cable
B-46
8.
When adding or replacing a processor module, you must also
remove one or more dust covers because:
Remove screws and
pull shroud straight up.
Insert board with
processor module.
Note: Front cover and board
carrier not shown for easier
viewing.