HP ProLiant BL45p Server series - Manual (Page 32)

32 HP ProLiant BL45p Server Blade User Guide
CAUTION: The processor is designed to fit one way into the
socket. Use the alignment guides on the processor and socket to
properly align the processor with the socket. Refer to the server blade
hood label for specific instructions.
6. Close the processor socket locking lever.
CAUTION: Be sure that the processor socket locking lever is
closed after the processor is installed. The lever should close without
resistance. Forcing the lever closed can damage the processor and
socket, requiring system board replacement.