No Audio Output Device is installed.

Jul 21, 2018
Last night I shut off my computer and went to bed, everything was working fine. When I woke up this morning there was no sound coming out of my laptop (Alienware). Whenever I hover over the sound icon it says, “No Audio Output Device is installed.” When I go to Sounds and Playback, nothing is there, it just says, “No audio devices are installed.” When I go to Recording it says the same thing. Please help.
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