Can you see the audio in the audio track? Meaning can you see the wavy line representing audio or do you see a small thin line down the center of the track (no audio)?
Yes, I can see the wavy line representing audio in the audio track.
No, I didn't mute the master bus nor hit the dim output button. I even try to create a new project which all these controls are default. Still, no sound came up except when play it from the trimmer window,,,,,
Under Options see if you accidently checked Mute All Audio. Even with that checked it will still play in the trimmer window, but not on the timeline.
I just tried it.