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06-02-2021 07:46 PM
There is a small battery, about the size of a $0.25 coin, on the motherboard.
The battery gives a "trickle" of power to the CMOS, to maintain the values stored in the CMOS.
When the battery dies, the values in the CMOS are lost, and you get that error-message.
Remove the battery from its socket, and read the etched part-number on its surface.
Spend a dollar or two to buy a replacement battery.
Power-on your computer.
Enter BIOS SETUP.
Set the date/time.
Save/Exit from SETUP.
06-03-2021 06:50 AM
Along with the info from @itsmyname , you might need to set the BIOS to defaults values, there is a setting for "defaults" while you are in there setting the date/time.
The typical CMOS battery is a CR2032
I'm not an HP employee.
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