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The minimum time required to leave a POS (Point of Sale) system powered down before restoring power is 2 minutes. This interval is crucial because it allows for the complete discharge of any residual electrical energy in the system's components. This ensures that all systems reset properly and can mitigate issues related to electrical surges or component stress that can occur if power is reapplied too soon.

Resting the system for a sufficient time also helps to clear any temporary data or states that may be held in the volatile memory, preventing potential errors during the subsequent boot-up process. This practice contributes to the longevity and reliability of the POS system by ensuring that all components have adequately reset and any minor faults can clear before re-energizing the unit. Following the recommended time can enhance overall performance and reduce the likelihood of glitches or hardware problems after power restoration.