HP ProLiant SL250s Gen8 Server - Manual (Page 35)

Hardware options installation 35
CAUTION: To prevent possible server overheating, always populate processor socket 2 with a
processor and a heatsink or a processor socket cover and a heatsink blank.
IMPORTANT: Processor socket 1 must be populated at all times or the server does not function.
9. Open each of the processor locking levers in the order indicated, and then open the processor retaining
bracket.
10. Remove the clear processor socket cover. Retain the processor socket cover for future use.