CMOS Battery error on Startup - unable to update BIOS

[TeresaM19]

Each time I switch on the HP 24 All-in-One PC I get the CMOS checksum BIOS error. 

Reinstalled Windows a few times but nothing works.

Also, Support Assistant indicating messages to be read - not showing when I open up the App.
My PC may need to be looked at by a professional and I do have an Extended Warranty. 
How would I go about sending it for repair.   Tips and advice please!!

[Bill_To · Accepted solution]

Greetings @TeresaM19 

Welcome to the HP Forum. 

Your PC's MB battery may need replacing.

Replacing a CR2032 MB battery is not too bad to do. But you'll need to disassemble the PC to get to the MB.

Sometimes HP provides AIO PC disassembly instructions. A specific HP Product Number would be needed to check for instructions. 

I would try a new MB battery before sending the PC to HP for warranty service.

Or the MB CMOS chip, responsible for storing real time data, has problems.

HP would probably replace the MB if a SMT component has failed.

Contact HP Support at the following Site to start a HP warranty RMA.

Regards

[TeresaM19]

Many thanks

The PC was collected today for a repair.

Hope it gets there without being damaged and the issue resolved soon.

[Bill_To]

Greetings @TeresaM19 

My pleasure.

I hope the repair goes well.

Regards

[TeresaM19]

Today was the first time I sent my PC off for repair 
Never heard of Flextronics before and concerned with the box used to transport my computer 🤔

Didn't get a DPD tracking number, so I can check it's got to its destination - hopefully in the same condition I sent it.

As a matter of interest, what is the turnaround time - they quoted 5th Sept.

[Bill_To]

Greetings @TeresaM19 

Flextronics seems to be a HP Partner.

I'm not familiar with DPD. I would think a tracking number should be issued by any carrier.

Did you insure contents?

I could not comment on your PC's repair turnaround time.

Regards

[TeresaM19]

Bill

This repair was initiated via HP Support and it was not mentioned that I should insure the contents

Many thanks for your help and advice - hoping for the best outcome.

Regards

Teresa

[Bill_To]

Greetings @TeresaM19 

My pleasure.

I haven't shipped a PC to HP for repairs since 2012. 

Maybe HP insures the contents both ways if HP covers shipping both ways.

Let the forum know how it all goes down.

Regards

[TeresaM19]

Good or bad - I will post the experience I received on here.

That is why I took out an extended warranty - to cover unfortunate events, and for my computer to be repaired. 

I have a Laptop and Printer with HP also, as I prefer to have a good support network that is easily accessible (no going round the houses to find a solution).

Kindest regards

[TeresaM19]

This is the latest information from HP Repair:

Event Status:  HP received your original product: 21/08/2025

Your product has been repaired. Primary issue with your product: CMOS FAILURE, BAD PART

HP shipped your product to you 21/08/2025 to address above

DPD UK tracking number is: 15503685112210.  Expected Delivery Date by Service Centre 21/08/2025

Didn't expect a such a fast turnaround -DPD email included this strange message

Remember to have the other item ready for a speedy exchange with your driver

Not sure what they are expecting me to give them in exchange for my computer!!

Just hoping my computer is delivered to me in one piece, and that it works properly