This is a previously used Dell Optiplex 755 Core 2 Duo tower. It has a built-in DVD player and the hard drive has been removed. The school that I got it from said it worked great and they just replaced a large group of their computers. This is the tower for one of the "all-in-one" systems. This tower comes with the cover. Smoke-free environment! I accept payment through PayPal, Visa, MasterCard, Discover, and American Express.