Appearance

The latest versions of Apple's iMacs place all of the computer's internal components behind an LCD screen. Save for the base, the iMac is about 1.25 inches thick. This miniaturization is achieved using parts designed for notebook computers.^{[citation needed]}

Through the 1990s, most computer cases had simple rectangular shapes, and were often painted beige. Beige box designs are still found on a large number of budget computers assembled from generic components.

The 1998 introduction of the Apple iMac led to greater enthusiasm for imaginative case designs^{[citation needed]}. Apple has continued to lead in the area of computer aesthetics, and has produced several innovative computers in small cases. Companies like Shuttle and AOpen have tapped the demand for small but customizable cases. The influence of these designs has led major OEM computer vendors, such as Dell and HP, to sell computers in more eye-catching cases, which may feature rounded edges, engraved logos, and translucent materials. Contemporary OEM computer cases have black or dark gray color, with metallic silver-colored accents.

Case modding is the artistic styling of computer cases, often to draw attention to the use of advanced or unusual components. Since the early 2000s, some cases have included clear side panels or acrylic windows so that users can look inside while it is operating. Modded cases may also include internal lighting, custom paint, or liquid cooling systems. Some hobbyists build custom cases from raw materials like aluminum, steel, acrylic, or wood.

Stickers are common on computer cases. These may advertise the manufacturer's logo, a list of the computer's specifications, the intended operating system (for example, "Designed for Windows XP"), the microprocessor used (such as Intel Inside) or, on homebuilt computers, any interest the builder may have. .

Prominent after-market case manufacturers include Ahanix, Antec, AOpen, Chieftec, Cooler Master, Ever Case, Foxconn, Gigabyte Technology, HEC Compucase, IXIUM, Lian Li, NZXT, OrigenAE, Raidmax, Shuttle Inc., SilverStone Technology, Thermaltake and Zalman.

Intrusion detection

Some computer cases include a biased switch (push-button) which connects to the motherboard. When the case is opened, the switch position changes and the system records this change. The system firmware or BIOS may be configured to report this event the next time it is powered-on.

This serves as a physical intrusion detection system and may help computer owners to detect tampering with their computer. However, most such systems are quite simple in construction; a knowledgeable intruder can open the case or modify its contents without triggering the switch.