My audio is grey, but no red light is on

Hi! I have an audio problem.
No Red light, but the sound icon is stuck on grey, wont allow me to move the volume bar, F10 F11 and F12 wont do anything and then they are touched, a "forbiden" icon appears below the big audio icon in the middle of the screen.
In system preferences everything is as usual, if I plug headphones says Headphones, if not, says Internal Speakers. The volume bar there has the Mute clicked but on grey, so I can't touch it.
I reseted the PRAM and VRAM and nothing. When computer starts up, it makes the sound, so the hardware works. Any Ideas?
Here the images:
Hoping someone can give me a hand.
Thanks!

Though, it works on VLC, but quicktime wont play any MP4 or other videos...
I've been around the forums, web, searching on google, and nothing seems ti solve this.

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