HP support jasne píše:
For all of the older Compaq models it was remove the AC power, main, and if applicable, the auxillery batteries and the RTC battery for 30 minutes. Plug in the ac and let the BIOS reset.
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In the case of the newer HP/Compaq models, however, the procedure has changed a little. Here is what the maintenance and service guide has to say:
Password Removal Policy
If the user forgets the system password, the user calls Technical Support to determine the proper removal procedure.
The user must provide proof of ownership and the notebook must be operated during the procedure. The password removal procedure is protected as HP Company PRIVATE INFORMATION There are a restricted number of locations that can perform password removal It might not be disclosed or distributed outside
those locations.