Familiarize yourself with DIMM configuration rules.
Prepare the system for service.
Remove the processor module containing the faulty DIMM. Place the processor module on an ESD-protect work surface. Remove the processor module cover.
A lit DIMM Fault Remind Power LED indicates that there is power available to light the faulty DIMM LED once you have pressed the DIMM Fault Remind button.
This will cause DIMM Fault LED associated with the faulty DIMM to light for a few minutes.