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- Notebook Boot and Lockup
- Cmos checksum is invalid error Cmos reset 502

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12-22-2020 01:06 PM
I have recently replaced my batter and after that whenever I press the power button it doesn't go on, I will have to connect the charger then I will hear small beeb then get this black screen with this error "the cmos checksum is invalid, Cmos reset 502"
When I reboot the laptop boots just fine, I have checked my system time and it is OK.
Can anybody help me in this please?!
12-31-2020 09:27 AM
@Abd4llah,Welcome to the HP Support Community!
Please follow the troubleshooting document to fix the Cmos checksum is invalid error Cmos reset 502 link
Hope this helps! Keep me posted.
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