Similar to the InterLock Chain found in the ProLiant 6000 and ProLiant 7000 Xeon servers, there is also one designed in the PL6500 Pentium Xeon server. There are not any mechanical panel interlock switches in this server. All side and top panels, Removable Media Bay and Hot Plug disk drive blanking panels, and Expansion slot covers should be installed during normal operations, and during service calls / testing to meet system cooling requirements. Temporary removal of the top panel for short periods of time to observe status LEDs on The System I/O Board is permitted. 
The InterLock chain is designed to detect the presence of and proper seating of these four components: 
Xeon Processor(s) 
Memory Board 
Standard Peripheral Board 
Miscellaneous Cable 
If one of these components isn't present or properly seated, the server will not power up. 
Verify that all InterLock LEDs on the System Board are OFF before troubleshooting a possible defective Hot Plug Power supply. During normal operations, auxiliary DC voltages are still present to these LEDs and the Integrated Management Display when the server is powered off from the front panel On/Off Switch. 
Note: It is necessary to unplug the AC power cords from all Hot Plug Power Supplies to safely replace any parts in the server
Memory	CPU4	CPU3	CPU2	CPU1	I/O	Misc	FAULT or INTERLOCK ERROR	
OFF	OFF	OFF	OFF	OFF	OFF	OFF	No Interlock error	
OFF	OFF	OFF	OFF	OFF	OFF	ON	Miscellaneous Cable	
OFF	OFF	OFF	OFF	OFF	ON	ON	Peripheral Board	
OFF	OFF	OFF	OFF	ON	ON	ON	Processor 1	
OFF	OFF	OFF	ON	ON	ON	ON	Processor 2	
OFF	OFF	ON	ON	ON	ON	ON	Processor 3	
OFF	ON	ON	ON	ON	ON	ON	Processor 4	
ON	ON	ON	ON	ON	ON	ON	Memory Board	
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