MSI Gaming 7 z97 audio crackling and noisy

[batman.gothamc]

Hi everyone. Today i start my PC but no sound. I turn up volume and then there was lots of cracking and popping. Was like interference or something.
Yesterday all was fine so i don't know why. I didn't update any driver, install program, or anything. The sound is bad also in the back port. I use stereo headphones btw.
I've already tried to unistall and reinstalla driver, tried it under ubuntu (i use Win 8.1), with and without audio boost, other headphones, different audio tracks and audio program, Youtube, secondary bios, disconnecting front audio.

What can i do? Audio only works with AMD driver on my monitor via HDMI, but not with headphones. Do you think that my onboard audio is broken?
I'm pretty frutrated about it, this is my second mobo, the first one has BIOS issue, i hope that RMA won't be necessary but...

Can you help me?

 

[Svet]

do >>Clear CMOS Guide<< with power cord removed

else try with mainboard out of PC case

 

[pandaz]

it might be your MB have touch something in the case, try to put the system out of the case to double check first 

 

[Svet]

yeah, that's what i already suggested him to try

 

[batman.gothamc]

Already tried with clearing cmos and even with secondary bios, but it happened suddently. Saturday it works, on sunday no. Inside my case is clear, i've cleared it some weeks ago. Some dust, but nothing special.
Strange thing is that both front and back doesn't works. It was untouched because i went to bed and then when i woke up it just doesn't work.
I'll try outside but seems strange though. If i've made some change it would be ok, but in this case i don't know what to think. Ghosts? 
It isn't windows, because elsewere ubuntu would work, but it doesn't. Isn't bios, isn't case cable, isn't any program...
This is my second faulty Gaming 7..