Dell PowerVault NX3100 Hardware Owner's Manual page 146

13 Run the appropriate online diagnostic test. See "Running the System
Diagnostics" on page 147.
If the test fails, the processor is faulty. See "Getting Help" on page 157.
14 Turn off the system and attached peripherals, and disconnect the
system from the electrical outlet.
15 Open the system. See "Opening the System" on page 66.
16 Replace processor 1 with processor 2. See "Installing a Processor" on
page 111.
17 Repeat step 11 through step 13.
If you have tested both the processors and the problem persists, the system
board is faulty. See "Getting Help" on page 157.
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Troubleshooting Your System