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500-277c bios power on password

500-277c
Microsoft Windows 8.1 (64-bit)

I have a 500-277c Desktop with the error message Enter Power-on password. I have tried everything on the web; changing the jumpers and leaving the battery out for a long period of time. Please help. Thank you. Tim

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500-277c bios power on password

Hi

Sometimes, when you enter a wrong password 3 times your laptop will display a hash code, with this hash code it may be possible to generate a bios master password for your machine.


HP have prepared rather lengthy documents,
and there are videos to watch, to cover, seemingly, all BIOS eventualities.

BIOS Problems LAPtops.
https://support.hp.com/us-en/document/c02693833


BIOS Problems DESKtops.
https://support.hp.com/us-en/document/c00007682

BIOS CheckSum error
https://support.hp.com/us-en/document/c01368145

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