Virus Infection: The presence of a virus or malware could impact the audio driver and force it to stop providing audio enabling assistance to the speakers of the dell laptop.
Windows Update: Moreover, an abrupt or sudden Windows update could fail the audio feature on your Dell laptop.
Hardware Failure: The hardware of the laptop could fail and stop working due to old age or occasional wear and tear.
Part 1: Why is the sound not working on my Dell computer?
Part 3: How to Recover Lost Data from Dell?.
Part 1: Why is the sound not working on my Dell computer?.