I am getting the Cmos check sum is invalid error Cmos reset (502)

[Sid_20]

When i am starting the laptop then this  Cmos check sum is invalid error Cmos reset (502) error occurs and  when i am plugging the charger the battery is 0 % it is not charging also  without the charger the laptop is not starting

[Garp_senchau]

@Sid_20, Welcome to HP Support Community,

Thank you for posting your query; I’m here to help by guiding you through steps to resolve this issue

During the startup process, the system performs a checksum test of the BIOS. If the checksum is incorrect, the BIOS is assumed to be corrupt and the system installs a hidden copy of the BIOS to correct the problem, and the startup process continues. The following message displays for 15 seconds before the computer automatically reboots. You have the option of pressing enter to proceed without waiting 15 seconds.

To resolve the CMOS Reset Error (502), follow this guide: HP PCs - 500, 501, or 502 error displays on a black screen | HP® Support

I hope this helps.

Please feel free to reply here if you have any questions or if you need further clarification on any of the steps. 

Take care and have a good day. 

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