IBM System x3100 M4

System-board external connectors
The following illustration shows the external connectors on the system board.
Video
Serial (COM1)
NMI button
Ethernet connector 2/
USB connectors 3&4
Ethernet connector 1/
USB connectors 1&2
System-board LEDs
The following illustration shows the LEDs on the system board.
IMM Hearbeat
LED
RTMM
Hearbeat LED
DIMM 1 - 4
error LEDs
Microprocessor
error LED
System board
error LED
Standby Power
LED
Note: When you disconnect the power source from the server, you lose the ability
to view the LEDs because the LEDs are not lit when the power source is removed.
18 IBM System x3100 M4 Type 2582: Problem Determination and Service Guide