Cant disable IGPU without boot crash

[Dance4me]

Cant disable IGPU without boot crash (Boot 0)

Hey guys...

I don't know what else to try. Probably Im doing just a stupid mistake.
Mavericks is installed and works. Win 8 as well (dual boot setup). I installed (on SSDs) without GPUs (2x7970): IGFX 1. Display, IGPU enabled, Graphicsenabler: No, IGPEnabler: Yes. Display connected via HDMI to Mobo. Everything works fine, I can boot with Chimera.
After adding the GPUs they get recognised OOB (Display is still connected to IGPU). Adding a DVI cable a dual display/dual graphics setting work without problems. But I want to run my build with just one display connected to the GPUs. So I disabled the IGPU in BIOS and set first display to PCie1 and connected the DVI cable at GPU in Slot 1 to the display and removed the HDMI IGPU-Display cable. Unfortunately Chimera crashes (see below). Also changing IGPEnabler to No or Graphicsenabler to yes or both doesn't change a thing. Neither does leaving first Display to IGFX in Bios or first Display PCie1 and IGPU enabled (that I want to disable actually ). What to do?

My specs:
2x Samsung SSD 840 Evo Series 120GB
1x Seagate Barracuda EcoGreen F3 1TB
1x Seagate Barracuda 7200.14 2TB
1x 4770k
1x Scythe Mugen 4
1x Gigabyte GA-Z87X-OC
2x R7970 Lightning Boost Edition
1x TeamGroup Elite DIMM Kit 8GB, DDR3-1333, CL9-9-9-24 (2x4)
1x LG DVD-burner
1x LiteOn iHOS104 black, SATA, bulk (-37)
1x be quiet! Dark Power Pro 10 750W ATX 2.31
1x Fractal Design Define R4 Black Pearl

 

[pozols]

Did you ever get this resolved? I have the same issue.

Thanks in advance.