Installation Boot Panic: Gigabyte Z97X-Gaming 3 + Intel G3258 + Mac OS 10.11.3

[BreBo]

Finally the last problem is that on my Geforce GTX 750 TI only the VGA port is working.

This is a known issue with Asus GTX 750 TI cards.
Some people have solved this by flashing other firmware.

Check these topics regarding this issue:
SUCCESSFUL Yosemite Install with ASUS GTX 750 Ti - but with HDMI not working...
Post your GTX 750 Ti NVCAP / IOREG

Audio is inactive too. Anybody already solved this on El Capitan?
Anybody Solved ALC1150 Audio ?

To get help with your audio issue post in:
http://www.tonymacx86.com/audio/