My PC has suffered a audio crash?

I was playing a video when it started getting all laggy and than the screen flashed for a moment or two. Right after all that my PC is apparently permanently mute. I examined the speakers they are connected right and play just fine on my iPhone. Would rebooting my computer remedy the problem? I don't mind doing that as long I back up every thing important.

Have you tried turning it off and back on again?

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