Lenovo ThinkSystem SN550, Maintenance Manual

Page: 108 / 138

Figure 75. System-board LEDs
Table 18. System-board LEDs
1
DIMM error 13–18 LEDs
4
DIMM error 19–24 LEDs
2
DIMM error 1–6 LEDs
5
Battery error LEDs
3
DIMM error 7–12 LEDs
6
Light path diagnostics LEDs
See “Light path diagnostics LEDs” on page 99 for information about how to interpret the system-board
LEDs.
General problem determination procedures
Use the information in this section to resolve problems if the event log does not contain specific errors or the
compute node is inoperative.
If you are not sure about the cause of a problem and the power supplies are working correctly, complete the
following steps to attempt to resolve the problem:
1. Power off the compute node.
2. Make sure that the compute node is cabled correctly.
3. Remove or disconnect the following devices, one at a time, until you find the failure. Power on and
configure the compute node each time you remove or disconnect a device.
• Any external devices,
• Surge-suppressor device (on the compute node).
• Printer, mouse, and non-Lenovo devices,
100
ThinkSystem SN550 Compute Node Maintenance Manual