Dell PowerEdge R810 Owner's Manual page 180

22 Install the cooling fan assembly. See "Installing the Cooling Fan Assembly"
on page 111.
23 Close the system. See "Closing the System" on page 85.
24 Repeat step 15 through step 17.
If your system has more than two processors, continue installing and
testing each processor in the processor 1 slot until you determine the
faulty processor, and then replace the faulty processor.
If you have tested all the processors and the problem persists, the system
board is faulty. See "Getting Help" on page 195.
180
Troubleshooting Your System