How do I clear the CMOS on the HP ProDesk 600 G1?
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. Replace the chassis access panel, reconnect the power cord, and turn on the computer to allow it to start. (Page 3)
From the official HP Prodesk 600 G1 Small Form Factor PC manual, page 3
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