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3. Remove the server cover and look inside the server for lit LEDs. Certain
components inside the server have LEDs that are lit to indicate the location of a
problem.
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 DIMMs1-8error LEDs (starting
from the bottom)
6 PCI slot 5 error LED 14 DIMMs9-16error LEDs (starting
from the bottom)
7 PCI slot 6 error LED 15 CPU 2 error LED
8 IMM heartbeat LED 16 CPU mismatch LED
84 ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual