On many 840 G7 units, this does not work because the password lives in non-volatile memory. You may only lose the date/time.
To avoid getting locked out of your computer in the future, make sure to: hp elitebook 840 g7 bios password reset
to generate an unlock key, though this is less reliable on newer G7 models. CMOS Battery Reset On many 840 G7 units, this does not
: While unlikely to clear a password on a G7, a hard reset can sometimes resolve BIOS-related glitches. Turn off the laptop, disconnect all power, and hold the power button for 15–30 seconds. For a CMOS reset, press and hold the Windows + V keys while holding the power button for 2–3 seconds. Unofficial and Technical Workarounds CMOS Battery Reset : While unlikely to clear
The methods below address the Power-On and BIOS passwords. If the Drive Lock is active, the data on the storage drive is likely unrecoverable without the password.
Shut down the laptop. Press or Windows Key + V while pressing the Power button. This attempts to load a fallback BIOS recovery. While this won't typically reset a password, it sometimes triggers a factory settings rollback if the password was set via a third-party management tool (like Absolute or Computrace).
This method is not supported by HP and involves high risk. It is typically performed by repair professionals.