Hardware malfunctions, driver problems and damaged registry files can cause a sound card to stop working. Sound card problems arise from improper maintenance of computer systems and may result in system freezes and installation errors.
Outdated drivers and changes in driver configuration may cause faults in the sound card, making it stop working. Reinstalling the drivers may solve this problem.
Inboard sound cards may malfunction if they are not set to "Auto" or "Enabled" in the CMOS setup, or when changes made to the setup are incompatible with the existing operating system. When the operating system becomes corrupt or defective, the sound card may stop working. Disconnected cables and defects in the sound card may also cause it to malfunction.