![](/images/new-backgrounds/1102911/102911305x1.webp)
System-board LEDs
The following illustration shows the LEDs on the system board.
PCI slot 1 error LED | Battery error LED |
PCI slot 2 error LED | |
PCI slot 3 error LED | VRM fail LED |
HS heartbeat LED | CPU 1 error LED |
PCI slot 4 error LED | DIMMs 1 - 8 error LEDs (starting |
| from the bottom) |
PCI slot 5 error LED | DIMMs 9 - 16 error LEDs (starting |
| from the bottom) |
PCI slot 6 error LED | CPU 2 error LED |
IMM heartbeat LED | CPU mismatch LED |
Chapter 6. Locating Server Controls and connectors 145