Thank you!
I tried ideneb with no luck. I just get a black screen and a blinking cursor.
With Kalyway 10.5.2 something is happening. I get a lot of text, it quits with the lines

Mac OS version:
not yet set

Kernel Version
Darwin Kernel Version 9.2.0 ,,,,,,, Release_I386


When i start with F8 and type -x more is happening:
At some point it takes quite some time after the line
rtl_r1000_nic_ext: Ethernet Adress: 00:22:15:4esomething.
Then there are some more lines, it stops at
The same point, but saying

Mac OS version:
9C2015



I run the latest BIOS on the machine, but there isn´t much to controll. Basically i can turn of the touch pad, set the boot sequence,

There is Intel Virtualization Tech and Intel VT-d
No idea what they are, they are both enabled right now.

SATA Operation Mode is set to Compatible, other mode is enhanced.