Dell PowerVault NX3000 Hardware Owner's Manual page 166

If the test fails, the processor is faulty. See "Getting Help."
18 Turn off the system and attached peripherals, and disconnect the system
from the electrical outlet.
19 Open the system. See "Opening the System."
20 Remove the cooling shroud. See "Removing the Cooling Shroud."
21 Replace the processor with the processor you removed in step 13. See
"Installing a Processor."
22 Replace the cooling shroud. See "Installing the Cooling Shroud."
23 Repeat step 15 through step 17.
If the problem persists, the system board is faulty. See "Getting Help."
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Troubleshooting Your System