How do I set or change a Power-On or Setup password?
Turn on or restart the computer and press the Esc key when the 'Press the ESC key for Startup Menu' message appears, then press F10 to enter Computer Setup. To change an existing password, type the current password, a slash (/), the new password, another slash, and the new password again in the format: current password/new password/new password. The new password takes effect the next time the computer is restarted. (Page 3)
From the official HP Compaq Pro 6300 SF Desktop manual, page 3
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