Step 2: Remove the Old Sound Card
Turn off your PC, leaving it plugged in to provide a ground path for eliminating static that can damage the machine. Remove the cover.
Unplug all cables connected to the back of your current sound card (those for speakers, microphone, line-in audio, and so on). Inside the case a thin audio cable runs from the CD-ROM drive to the sound card (or to your motherboard). Remove the connector on the sound card. If the wide, gray data cable from your CD-ROM drive is connected to the card, remove it.
Next, remove the screw holding in the sound card and carefully lift out the card.
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