IBM System x3500

System-board LEDs
The following illustration shows the switches and LEDs on the system board.
Slot 1
error LED
Slot 2
error LED
Slot 3
error LED
Slot 4
error LED
Slot 5
error LED
Slot 6
error LED
Microprocessor
mismatch
LED
DIMM
error LEDs
1 thru 12
Microprocessor 1
error LED
Microprocessor 2
error LED
VRM error
LED
BMC heartbeat
LED
ServeRAID-8k
error LED
Battery error LED
System-board external connectors
The following illustration shows the external input/output connectors and the NMI
switch on the system board.
Mouse
Keyboard
Serial 1
(COM 1)
VGA
LPT
Serial 2
(COM 2)
USB 4
RJ45
RJ45
NMI
USB 3
10 IBM System x3500 Type 7977: Problem Determination and Service Guide