There are a few different types of black windowless computer cases on the market, but the most popular type is the cube case. This type of case has a black front and a white back. It is perfect for people who want a computer that is black and silent. Another popular type of black windowless computer case is the all-in-one. This type of case has a computer, a monitor, and a keyboard all in one unit. This is perfect for people who want to have a computer that is all in one place.