121-A Critical Error occurred prior to this power-up

Symptom

121-A Critical Error occurred prior to this power-up.

System Halted!

Cause

A critical error occurred.

Action
  1. Reboot the server.
  2. If the issue persists, open a support case using the Hewlett Packard Enterprise Support Center website (https://www.hpe.com/support/hpesc).