Configuration changes, such as added devices or adapter firmware updates, and firmware or application code problems can cause the server to fail POST (the power-on self-test). If this occurs, the server responds in either of the following ways:
- The server restarts automatically and attempts POST again.
- The server hangs, and you must manually restart the server for the server to attempt POST again.
After a specified number of consecutive attempts (automatic or manual), the Nx-boot failure feature causes the server to revert to the default UEFI configuration and start the Setup Utility so that you can make the necessary corrections to the configuration and restart the server. If the server is unable to complete POST with the default configuration successfully, there might be a problem with the system board.
You can set the number of consecutive restart attempts that will trigger the Nx-boot failure feature, in the Setup Utility. To specify the number, click 3, 6, 9, and Disable Nx-boot failure.. Then, choose the item from the following available options: