CMOS checksum invalid

[Harsha0495]

Hello, My laptop model is HP 15  CC-129TX;

The problem is that I am getting an error message on startup as 

 "The CMOS checksum is invalid. 
The CMOS will be reset to the default configuration and will be rebooted. 
Please check your BIOS Setup options to see if they changed. 
CMOS Reset (502) 
ENTER - Reboot the system"

previously also I have got the same error and so recently  2-3 months back I have replaced my internal battery TF03XL and  it worked fine  and again  the same problem has occurred;    I am not sure if the problem is with the battery or some other part or BIOS

tried to check with the page https://support.hp.com/in-en/document/c01443485#:~:text=To%20resolve%20the%20BIOS%20Recovery,update%....  but couldn't solve the issue; 

Kindly help with the solution 

[praveenbv]

Hi@Harsha0495, Welcome to the HP Support Community!

We reviewed your post and I understand that the  Notebook is not Powering ON,

Don’t worry, I assure you I will try my best to get this sorted.

I recommend you follow the below steps and check if it helps

Do you see a light at the place where the charger connects to the laptop? If yes then it indicates that the charger is all fine.

I recommend you to perform the following steps to isolate the issue and arrive at a fix: 

• Remove the battery out. If the battery is integrated and does not have a latch to release it then leave the battery inside the laptop.
• Disconnected AC adapter from the laptop.
• Press and hold the power button for 15 seconds.
• Reconnect the battery and plug the AC adapter.

F6 + Power Button

• CMOS Rest ( combination of windows button and letter 'V' then push the power button ones and release the windows and letter 'V' after 5sec

If the laptop does not power on then please continue with the below steps:

• Disconnect the charger and remove the battery out.
• Connect only the battery and check if the laptop powers on.
• Likewise, remove the battery out (if removal battery ) and connect only the charger and check if that helps.

Hope this helps! Keep me posted.

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Have a great day!