How do I clear the CMOS on the HP Compaq Pro 6300 SF Desktop?
Turn off the computer and disconnect the power cord from the power outlet, then remove the access panel. On the system board, press and hold the CMOS button for 5 seconds, then replace the chassis access panel, reconnect the power cord, and turn on the computer and allow it to start. (Page 3)
From the official HP Compaq Pro 6300 SF Desktop manual, page 3
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