Here a giant spool of steel is fed into a hydraulic press, which will bend the sheet around a case tooling to form the beginnings of a component. It's automated and presses down every three seconds or so.
Here's a closer look at the press. Notice all the metal debris being punched out and falling below. The press is outfitted with a tooling, with metal fed through by the machine pictured in the last image. A worker watches over it out of frame.
Here a robot arm grabs a PC case panel and moves it from one press to another. Each press has its own tooling set on it to shape a different element of the case. If you look at the writing on the tooling, you'll notice it belongs to the H440.
While part of the assembly line used these robot arms to move components between toolings, much of it was done by hand, as you'll see in the next images.