Determine Which DIMM Is Faulty
This procedure describes how to use the DIMM LEDs on the motherboard to pinpoint the physical location of a faulty DIMM.
Note - You can also obtain the location of the faulty DIMM using the fmadm faulty command. This command displays the FRU name. See Managing Faults and DIMM FRU Names.
 | Caution - Components inside the chassis might be hot. Use caution when servicing components inside the chassis. |
- Check
the front panel Fault LED.
See Interpreting LEDs.
When a faulty DIMM is detected, the front panel Fault LED is illuminated. Before opening the server module to check the DIMM Fault LEDs, verify that the Fault LED is lit.
If the Fault LED is not lit, and you suspect there is a problem, see Diagnostics Process.
If the Fault LED is lit, go to the next step.
- (If needed) Prepare for service.
- Press the Fault Remind button
on the motherboard.
While the Remind button is pressed, an LED next to the faulty DIMM lights, enabling you to identify the faulty DIMM. See DIMM LEDs.
Tip - The DIMM Fault LEDs are small and difficult to identify when they are not lit. If you do not see any illuminated LEDs in the area of the DIMM LEDs, use the fmadm faulty command and the DIMM layout table to locate the faulty DIMM. - Remove the faulty DIMM.
See Remove a DIMM.