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Obviously, a case is a case. You want to pick a case that will effectively suit your needs and maybe your personal style. There are now many clear cases available that have blacklighting effects and other cool things. A power supply is what is going to power everything inside the computer. The power supply has different wires that come out of it that go to each component such as the hard drive, cd-rom drive, floppy drive, etc.
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The case is there to hold all of the computers components in an effective and protective manner. It is good protection from outside elements such as dust or flying projectiles that may hit your computer. The power supply is a necessary component because without it, you don't have power.
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Most cases will come with a power supply already installed or on the side ready for you to screw in. There are two kinds of cases that are most common. There is the AT style case and the ATX style. The ATX case is more commonly manufactured because most motherboard manufacturers make their motherboards in the ATX style. When you go to buy your case, have in mind all the components that you want to have (For example: CD-ROM, CD Burner, DVD-ROM, DVD Burner, etc.) so that your case can fit your needs.
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Hold the power supply firmly by the bottom and bring it forward until it matches up with the screw holes. Most of the time, your power supply should just slide ride into place.
Once the screw holes are lined up, put in the screws and tighten firmly.
You also want to make sure that the switch between 110 volts and 220 volts is set to 110 volts if you are in the U.S. The 220 volt switch is for other countries or Europe that use 220 volts of power.
Note: Because every computer is different and has different components from another, the way your power/reset buttons will be hooked up will be different. In order to complete this step, please consult the information that came in the manual with your motherboard and any information that came with your case.
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