In one sentence, describe what the following article is about:

Nearly all modern computers have the sound card built-in to the motherboard. You can double-check that you have a sound card built-in by looking for speaker jacks on the back of the computer. Sound cards are really only necessary for audiophiles and recording studio computers, or for very old computers that don't have built-in sound. This will allow you to move your computer to a place that allows you to easily access it. Place the computer on its side on a table, with the ports on the back closest to the table. The ports are connected to the motherboard, so having them closest to the table will ensure that you can get to the motherboard when the case is open. Avoid laying the computer on carpet. Most newer cases have thumbscrews, but you may need a Phillips-head screwdriver. The screws run down the back of the computer. Remove the panel on the opposite side of the motherboard and set it aside. You should always ground yourself when working inside your computer. You can use an electrostatic wrist strap or touch a metal water tap to discharge any electrostatic buildup. If you don't ground yourself, you run the risk of damaging your components with electrostatic discharge. Since your computer is open, you should take this opportunity to clean out the dust that has built up inside the case. Too much dust can lead to overheating, which can lead to your components failing. Use compressed air to remove as much dust and debris as possible. Make sure to get in all of the nooks and crannies.

Summary:
Ensure that you need a sound card. Power down your computer and remove all the cables. Remove the side panel on your computer. Ground yourself. Clean out any dust.