NEC Express5800 series User Manual page 170

Make sure that the heat sink is level.
11.
NOTES:
If the heat sink is not level, remove it, and then install it again. The
following probably causes the heat sink not to be level:
– The CPU is not positioned correctly.
– The wire clip is not engaged correctly.
Do not move the secured heat sink.
Install the components you removed previously.
12.
Power on the server, start the SETUP utility, and set "Processor Retest" of "Processor
13.
Settings" on the Main menu to "Enable".
Verify that POST displays no error messages.
14.
If POST displays an error message, take a note on the message and see the POST error
messages listed in Chapter 8.
Set "Reset Config Data" on the Advanced menu to "Enable".
15.
This setting is required to change the hardware configuration data.
160 Upgrading Your NEC Storage