If the sound has suddenly stopped working then the most likely solution is that the audio safety setting in the I-Series Control Center/C-Series Hardware Options has become unchecked by an update or another program.
1. Open the Control Center (or C-Series Hardware Options) .
2. Select Safety.
3. Make sure the Audio and Temperature safety settings are both checked.
For ISeries+ devices, check that it was not switched to headphones.
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