Dell part number 0CN312 is a front I/O panel assembly for OptiPlex 775 desktop systems. This replacement component integrates USB ports, audio connectors, and power/reset buttons for the tower form factor chassis. Compatible with OptiPlex 775 models across Dell's lineup, the assembly mounts to the case front bezel and connects via internal headers to the system motherboard. Typical applications include workstation rebuilds, system repairs, and component replacement in business desktop environments. The refurbished unit has been tested and is guaranteed fully functional and available via quote.