About Our Reconditioned Systems: All of our reconditioned systems undergo a rigorous testing and verification process. After a thorough testing and diagnostic procedure, each individual system is put through a continuous 24 hour stress test. At the end of this 24 hour burn, the machines are once again run through testing and diagnostics before being thoroughly cleaned and ready for shipment. Each system includes a new keyboard and mouse, and is backed by a 60 day Over The Counter Warranty.