How can I change my system's setup or power-on password?
To change a Setup or Power-On password, restart your computer and press the Esc key followed by F10 to enter Computer Setup. At the key icon prompt, type your current password, a slash, new password, another slash, new password again (example: currentpassword/newpassword/newpassword). Press Enter for changes to take effect next restart (Page 3).
From the official HP Compaq Pro 6300 SF Desktop manual, page 3
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