All units are carefully inspected and thoroughly tested by our Dell & A+ Certified technicians. If any component does not meet our rigorous standards, the component is replaced and the unit is re-tested. During our process, hard drives are wiped clean and loaded with a genuine licensed copy of Windows. At Notebook Avenue, we take pride in offering you the best equipment at the most competitive price around. We look forward to serving all of your equipment needs. Buy with confidence!