Windows – Volume lowers down automatically on windows 8 when monitor shuts off

My computer runs a clean install of windows 8, and the volume lowers down automatically on any software or browser playing music when the monitor shuts off.

The speakers are not connected to the monitor.

(it doesn't mute completely, it always goes down about the same percentage)

I don't have a screen saver set, I only set the monitor to shut off after 5 minutes of inactivity and ask for password when the monitor is on once again. Also the computer is set to never hibernate or go to sleep.

This happens always, to the point that if i start working on the computer and walk away again and again, the volume lowers down every single time, so listening to music while away from the computer is pretty much impossible.

I have tried this:

(Control Panel > Hardware and Sound > Sound > Communications tab & Select "Do Nothing")

As in this question VLC turns down Sound volume when monitor is turned off before even searching here, and it didn't work.

On volume mixer, the device volume does not go down, only the application itself.

Also, under power options, i have searched under every single setting, and have seen nothing special.

Viewsonic monitor, windows 8 pro x64, tried with pandora, winamp, rockradio1, vlc, windows media, always the same result.

Any suggestions?

Cheers!