My comouter just has a system update yesterday. But, I found that this pc has no sound when I just play with it today (no sound in Youtube, ..everything) This problem keep existing after it went through system audio check and hp audio check and repair (+restarting the pc). The pc seems to have audio signal (knowing it should have sounds)(the volume bar keep fluctuating with the audio source), but physically it has no sound at all. Please help. I don't know what is going on, and don't know how to fix it now.