CMOS CHECKSUM INVALID on my HP notebook

[Shazzar1]

When i try to switch my laptop on its taken for ever, i need to plug it in and wait for ages, once it comes to life it is saying CMOS checksum is invalid, I have recently changed the battery as it wasnt holding a charge and had to update the BIOS and now this is happening since then. I have been through settings and checked and everything seems ok , but not sure what to do next?

any advice would be appreciated 

[Raj_05]

Hi @Shazzar1,

Welcome to HP Support Community.

Thank you for posting your query, I will be glad to help you.

The "CMOS checksum is invalid" error typically indicates an issue with the CMOS settings or the CMOS battery. Since you've recently changed the battery and updated the BIOS, it's possible that the BIOS settings need to be reconfigured.

Here are some steps you can try to resolve the issue.

Check CMOS Battery Installation: Ensure that the CMOS battery is installed correctly. Make sure the side with the positive sign (+) faces up. If there's any doubt, try reseating the battery.

Load Default BIOS Settings:

• Restart your HP laptop.
• During the startup process, there is usually an option to enter the BIOS/UEFI settings. This is often achieved by pressing a key like Esc, F1, F2, F10, or Delete. Refer to your laptop's manual or look for on-screen prompts during boot.
• Once in the BIOS/UEFI settings, look for an option like "Load Setup Defaults," "Load Default Settings," or something similar. Choose that option and save the changes.

Check Date and Time Settings:

• Incorrect date and time settings can sometimes cause the CMOS checksum error. Set the correct date and time in the BIOS/UEFI settings.

Update BIOS (if needed):

• Ensure that you have the latest BIOS version installed. Sometimes, updating the BIOS can resolve compatibility issues and improve system stability.

Clear CMOS:

• If the issue persists, you may try clearing the CMOS. This typically involves moving a jumper on the motherboard or removing the CMOS battery for a few minutes. Be sure to consult your laptop's manual for instructions on how to clear CMOS.

Remember that making changes to the BIOS settings carries some risk, so proceed with caution and make note of any settings you change so you can revert them if needed.

I hope this helps.

Take care and have a good day.

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Alden4

HP Support