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.

1. 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.

2. (If needed) Prepare for service.

   See Preparing for Service.

3. Press the Fault Remind button on the motherboard.

   While the Fault Remind button is pressed, an LED next to the faulty DIMM lights, enabling you to identify the faulty DIMM. See DIMM LEDs.

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   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.

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4. Remove the faulty DIMM.

   See Remove a DIMM.

Related Information

• DIMM FRU Names

• Remove a DIMM