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- HP Community
- Desktops
- Desktop Operating Systems and Recovery
- CMOS reset (502)

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02-01-2024 02:20 PM
Hi @crazy05boss,
Welcome to HP Support Community.
Thank you for posting your query, I will be glad to help you.
The CMOS reset (502) error typically indicates an issue with the CMOS battery or the CMOS settings on your laptop. Since you mentioned that the problem started after a battery replacement, it's possible that the CMOS battery replacement or the replacement process may have affected the CMOS settings.
Here are some steps you can take to troubleshoot and resolve the issue.
Check CMOS Battery Connection:
- Ensure that the CMOS battery is properly connected. Open your laptop and make sure the CMOS battery is securely in place.
Reset CMOS Settings:
- Access the BIOS/UEFI settings during the boot process (usually by pressing a specific key like F2, Del, or Esc).
- Once in the BIOS/UEFI, look for an option to reset or load default settings. This will reset the CMOS settings to their default values.
- Save the changes and exit the BIOS/UEFI.
Update BIOS/UEFI:
- Check if there is a BIOS/UEFI update available for your laptop on the HP support website. If there is, update your BIOS/UEFI to the latest version.
Check for Loose Connections:
- Make sure all internal components, including RAM and storage devices, are properly seated in their respective slots.
Check Power Settings:
- Ensure that the power settings in the BIOS/UEFI are configured correctly. Some power-related settings might be causing the issue.
Replace CMOS Battery:
- If the problem persists, consider replacing the CMOS battery with a new one. A faulty CMOS battery can cause such issues.
Remember to back up important data before making any changes to the BIOS/UEFI settings.
I hope this helps.
Take care and have a good day.
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Alden4
HP Support
HP Support Community Moderator