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If it locked at the boot screen [bios password] you will need to send it in to an HP service center to have this bios password removed. If you mean the windows login, you can either use a password reset disc if you created one, or simply re-install windows.
HP Spare Key can be
used to reset BIOS password. It is provided by HP Corporation. So when you
forgot BIOS password on HP computer, just download it and get perfect BIOS
How to reset HP bios
password with Spare Key or other ways?
The master password for Compaq is "compaq" If that doesn't work you need to use a jumpe on the motherboard: This Jumper is often named like: "RTC_CLEAR" , "CLEAR CMOS"
, "CLRCMOS" , "CLRCMS". His position is often near by the motherboard battery. You will need to reconfigure any BIOS changes that you have done.
Some BIOS manufacturers implement a backdoor password. The backdoor password is a BIOS password that works, no matter what the user sets the BIOS password to. These passwords are typically used for testing and maintenance. Manufacturers typically change the backdoor BIOS passwords from time to time.
BIOS Password Compaq
Notebooks are tough. Some systems, like Toshiba, have a USB based dongle you can purchase to reset the BIOS PC startup password. I'm not sure how Compaq does it, but I would recommend you contact HP/Compaq. It's likely that they will require you to mail it in for them to take care of.