I guess someone went ahead of me because the problem is fixed. After doing (today) apt-get upgrade at the core and image rebuild of the zotac mag. Video issues are corrected!
Greate Job!!!! Was it you L3mce?
For the hdmi sound I guess it is better to start a new post so people is not confused or lost by this post subject but in a few words I can mention what I did.
1. Figure out which port was for HDMI sound. Check xorg log to understand hdmi "monitor" capabilities, in my case for for the MAG was no issue, for the ZBOX it was because I have a DENON receiver so the nvidia driver did not detected HDMI audio capabilities on him.
In my case device 7 was the one used for hdmi audio, like L3mce mentioned. I modified the asound template under user pluto and that was it. Of course that before that I did some testing to make sure that device 7 was the one.
I erased the line "options snd-hda-intel model=auto " at the modprobe/alsa-base.conf because it was causing problems with the asound.conf file. Disabled the Intel audio board at the bios so only the NVIDIA HDA was seen. Also for the zotac ZBOX I needed to update the alsa drivers because it was not recognize at the begining. If anyone have any questions I will try to do my best to share my little knowledge
Ill try to post (if necesary) a new post with detailed step by step.