POST Error bypass

[Tugi1]

We are encountering a serious blocker during boot when POST error messages such as "Power supply configuration has changed" or "CPU fan not detected" appear and require user interaction to press ENTER in order to continue.

These HP units are deployed in an unmanned environment where no human intervention is possible.

The BIOS has been upgraded to the latest version, however there is still no option to bypass or suppress these POST error prompts.

Do you have any recommendations on how to override this behavior or allow the system to continue booting automatically?

[Pallipurath]

Hi @Tugi1,

Welcome to the HP Support Community.

Thank you for posting your query.

I understand that deploying HP systems in unmanned environments, encountering POST error messages that require manual intervention can indeed be problematic. I would request you to please follow the steps:

Fix Root Cause of Error

• CPU fan not detected:
• Ensure the fan is connected to the correct header (CPU_FAN, not SYS_FAN).
• If using aftermarket cooling, connect tachometer wire to CPU_FAN header.
• Some users add a “fan simulator” (resistor/tach signal generator) to trick BIOS.
• Power supply configuration changed:
• Verify PSU cables are firmly seated.
• If you swapped PSU, clear CMOS and let BIOS redetect.
• Use HP‑approved PSUs if possible.

BIOS Settings

• Enter BIOS (F10) → Advanced → Boot Options.
• Look for “POST Behavior” or “Prompt on Error.”
• On consumer HP units, this is usually missing, but worth checking.

CMOS Reset

• Clear CMOS (remove battery or use jumper).
• This can clear persistent “configuration changed” messages.

Take care and have an amazing day!

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Regards

Pallipurath.

[Pallipurath]

Hi, 

We did not hear from you after I replied to your post that you had created on the HP Support Community. 

This is a follow-up to know if the issue that you were facing with your HP product has been resolved. 

If you encounter any more hiccups or have questions, please don't hesitate to reach out. We're here to help and support you every step of the way!  

  

We'll be archiving this case, but feel free to respond to this thread anytime to continue the conversation.  

  

Please mark this post as “Accepted Solution” if the issue is resolved and if you feel this reply was helpful click “Yes”. 

  

Take care, and have an incredible day ahead!  

  

Best regards

Pallipurath