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The front panel header often confuses builders moving this board to a new case. Based on community pinout guides , the standard 10-pin layout is roughly: Pins 1 & 3: HDD LED (+/-) Pins 2 & 4: Power LED (+/-) Pins 5 & 6: Power Switch Key (no pin) Pin 8 & 10: Maintenance & Downloads Dell OptiPlex 390 System BIOS | Driver Details