Lenovo THINKSERVER 3821 - Manual (Page 153)

System-board LEDs
The following illustration shows the LEDs on the system board.
1 PCI slot 1 error LED 9 Battery error LED
2 PCI slot 2 error LED 10 System-board error LED
3 PCI slot 3 error LED 11 VRM fail LED
4 HS heartbeat LED 12 CPU 1 error LED
5 PCI slot 4 error LED 13 DIMMs 1 - 8 error LEDs (starting
from the bottom)
6 PCI slot 5 error LED 14 DIMMs 9 - 16 error LEDs (starting
from the bottom)
7 PCI slot 6 error LED 15 CPU 2 error LED
8 IMM heartbeat LED 16 CPU mismatch LED
Chapter 6. Locating Server Controls and connectors 145