HPZ420 Workstation Memory Training Error

Error at boot:

942-Memory Training Error.
    DIMM 5 on CPU 0 experienced an error during training (CODE 3015)


Go to BIOS Setup (F10) 
Power tab
Select OS Power Management -> change 'Idle Power Savings’ from ‘Extended’ to ’Normal'
Select Hardware Power Management -> check ’S5 Maximum Power Savings’ must be in ‘Disabled'

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