After removing the CMU from the server, you have approximately 60 minutes to press a DIMM Fault Remind button to find a faulty DIMM.
There are two Fault Remind Buttons on the CMU. If you press a Fault Remind Button, a green LED should light to tell you that the circuit has power. When you press the correct Fault Remind button, a yellow LED lights to show you the faulty DIMM.
Note - If the green LEDs do not light, the circuits are out of power. In this case, use the show fault error message to locate the faulty DIMM. See Locate a Faulty DIMM.