Cabinet (ATX)

Checklist before buying a cabinet for your PC
Support for the same form factor as the motherboard.
Support for ATX standard. (Pentium IV needs the newer ATX 2.03 standard)
Power supply rated above 300 W.
Support for extra cooling fans.
The power supply should have a vent directly over the CPU and the grill should be properly spaced to allow hot air to flow out.
Socket for plugging your monitor.

Cabinets today are manufactured with a great deal of imagination. So, there might be a great deal of difference between their shape, arrangement of side panels, etc. The same goes for the motherboard. The cabinet and motherboard shown here are just sample ones, and the positioning of parts and their working will differ across models.