How can I reset the computer to factory defaults via Computer Setup?
Press and hold F10 during startup when the monitor light turns green to access the utility. Select 'Advanced' > 'Power-On Options' > 'Apply Defaults and Exit'. This will return the system settings to factory defaults, clearing any established passwords or changes made. (Page 24)
From the official HP Compaq Pro 6300 SF Desktop manual, page 24
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