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Power Supply and Accessories
The power supply often comes with the case, even though it isn't really part of the case. The power supply comes with an integrated fan, secured to the back of the case in AT form factor supplies, or the front (to blow into the case) for most ATX supplies. The power supply is discussed in its own section here.
The power switch for AT and earlier form factor cases is really part of the power supply; for ATX, NLX and WTX form factor cases it is a separate component attached to the case. The switch on most modern PCs is mounted just behind a plastic button that is accessible from the exterior of the case. Most cases also come with a standard power cord, usually black, to plug the power supply into the wall.
Note: Not all cases come with a
power supply. Don't assume that a more expensive case will have a power supply included
and a cheaper one won't, because often, it is the exact opposite. (Those who care about
getting a good power supply, an important but oft-ignored component, often prefer to
purchase it separately.) Be sure of what you are buying!