CMOS Reset Error occurring very frequently

[Anonymus149]

My laptop has been showing a CMOS Reset error (CMOS Checksum Invalid) very frequently while booting. This is a serious problem that requires immediate attention. Please let me know if there is a solution for this issue.

[Raj2111 · Accepted solution]

Hi @Anonymus149 

Welcome to the HP support community.
 

I understand you're experiencing an issue with your HP device, and I apologize for any inconvenience this may have caused. I'm here to help you today.

The CMOS Checksum Invalid error, often accompanied by the message CMOS Reset, typically points to an issue with the CMOS battery or the system's BIOS/UEFI settings. This issue can result in incorrect date and time settings, or the BIOS not properly retaining its configuration after powering down.

The CMOS (Complementary Metal-Oxide-Semiconductor) battery helps the BIOS store system settings and keeps the system clock running when the laptop is powered off. If the CMOS battery is faulty or the BIOS settings are corrupted, the system may show the CMOS Checksum Invalid error.

Causes of the CMOS Checksum Invalid Error:

1. Dead or Weak CMOS Battery: The most common cause of this error is a weak or failing CMOS battery. This battery is usually a small coin-cell battery (CR2032) on the motherboard.
2. Corrupted BIOS/UEFI Settings: If the BIOS settings become corrupted, it may lead to a checksum error.
3. BIOS Update Failure: If a BIOS update was incomplete or went wrong, it could cause this error.
4. Faulty Motherboard: In rare cases, a malfunctioning motherboard can cause the BIOS to lose its settings.

Solutions for the CMOS Checksum Invalid Error:

1. Replace the CMOS Battery

The first step is to check and replace the CMOS battery if it's old or weak. The battery is typically a CR2032 coin cell and can be found on the motherboard.

• To replace the CMOS battery:
  1. Turn off the laptop and unplug it from any power sources.
  2. Remove the back panel or access panel of the laptop (you may need a screwdriver).
  3. Look for the CMOS battery (it will be a small, round, silver battery).
  4. Carefully remove the old battery and replace it with a new CR2032 or the same type specified by your laptop’s manufacturer.
  5. Once the new battery is in place, reassemble the laptop and power it on.

After replacing the CMOS battery, the CMOS Checksum Invalid error should be resolved if the problem was caused by a depleted battery.

2. Reset the BIOS to Default Settings

If replacing the CMOS battery does not fix the error, resetting the BIOS to its default settings might help resolve any corrupted settings:

• Power on your laptop and immediately press the F10 key (or Esc, depending on your laptop) to enter the BIOS setup menu.
• Look for an option like Load Default Settings or Restore Defaults.
• Save the changes and exit the BIOS. This should restore the BIOS to its default configuration.

3. Update or Reinstall the BIOS

If your BIOS has become corrupted, updating or reinstalling it can help. Be cautious when updating the BIOS, as an incorrect update could damage the system.

• Go to the HP support website and search for your laptop model (HP OMEN 16.xd0000).
• Download the latest BIOS update for your laptop.
• Follow the instructions provided by HP for updating the BIOS.

If you are unsure about updating the BIOS, you can contact HP support for guidance.

4. Check for Hardware Issues

In rare cases, hardware issues like a malfunctioning motherboard or faulty connections can cause the CMOS error.

• If you’ve replaced the battery and reset the BIOS settings, but the error persists, consider checking with a professional technician to ensure there’s no deeper hardware issue with the motherboard.

Additional Steps to Try:

Clear the CMOS (Manual Reset)

1. Power off the laptop and unplug it.
2. Remove the battery (if possible) and the CMOS battery.
3. Press and hold the power button for 30 seconds to drain any residual power.
4. Reinstall both the main battery and CMOS battery.
5. Power on the laptop.

Perform a BIOS Recovery

If your BIOS has become corrupted, some HP laptops offer a BIOS recovery feature:

1. Turn off the laptop.
2. Press and hold the Windows + B keys on your keyboard.
3. While holding the keys, press and hold the power button for about 5-10 seconds.
4. Release the power button, but continue holding the Windows + B keys until the HP logo appears.
5. The laptop should enter a BIOS recovery mode and attempt to restore the BIOS.

I hope this helps! Keep me posted.

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution.
 

-Regards
Raj-HP Support
 

[Raj2111]

Hi @Anonymus149 

Welcome to the HP support community.
 

please follow the steps from my previous post

I hope this helps! Keep me posted.

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution.
 

-Regards
Raj-HP Support
 

[Anonymus149]

Thank you

[Anonymus149]

Really sorry for replying late

I had asked hp to replace my battery and was waiting for it to come, and then I would check with that and confirm with the solution

[Raj2111]

Hi @Anonymus149 

Sure, Please keep me posted.

have a nice day 🙂
 

-Regards
Raj-HP Support

[AmarieDelsie]

I’ve noticed this happens even after shutting down the device properly. I suspect it might be related to the CMOS battery or BIOS settings, but I’m not sure how to resolve it. If anyone has faced this issue before or knows an effective solution, please share your advice.