Randomly when I attempt to launch Minecraft, the client will make no sound, and won't even appear in my Volume Mixer. The only way I've seen to temporarily fix this is by running the Minecraft installer under the Repair option. My laptop has the same issue, but its much less common than on my desktop. I've tried re-installing the Minecraft runtime, the game, and even attempted a factory reset on my laptop and after about a week the issue started occuring again.