There's a difference between a refurbished computer that merely appears brand new and one that actually performs as if it just rolled off the manufacturing line. CDI, a refurbisher that serves many Us school districts, uses rigorous testing to ensure its products meet the higher standard. "We do more checks, both automated and by technician," says Chris Bristow, CDI's operations manager. "And we go deeper into the machine to ensure every component is working, as opposed to simply checking that the unit is operable." Attention to detail makes the difference. Is the monitor bright and clear?