Don't give up yet

I recently installed that version on my hp dv7-2185dx and I also have an ATI HD4650

I assume when you installed iAtkos7 you chose the ATI HD kext in the customize menu?

If so that is why your screen is going black, and unfortunetly once you install that kext, even if you boot with -x it still loads the extension so the screen will always be black.

So, just install it and do not choose a vga kext. This will at least let you use the OS, and with the graphics mode boot option I think you should be able to increase the screen resolution.