How do I reset the CMOS settings?
Resetting CMOS involves removing power from the system, opening the case to reach certain pins or jumpers, and short-circuiting them for a few seconds before re-assembling. Consult detailed steps given in the Maintenance and Service Guide on page 92 to safely perform this operation without risking hardware damage.
From the official HP Prodesk 600 G4 Small Form Factor PC manual, page 92
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