mnik

Thank you.  You're absolutely right.

I'm not sure what had happened to my kexts but I guess I had messed them up trying a million different things to get it to work.
I reinstalled OS X from scratch and simply added my device-id to the kexts and everything is fine.
3 screens with 3D acceleration and rotation.
Performance is not fantastic but I guess this GPU is somewhat underpowered for OS X, it is certainly acceptable though.

Thank you again for your help.

I have made good progress on this issue...

By comparing kextstat from safe mode to normal mode I saw that both AMDRadeonAccelerator and ATIFrambuffer kexts were loaded in normal mode.  I assume there is some conflict here because after moving AMDRadeonAccelerator out of the way I get three screens with no scrambling!
I'm not sure where AMDRadeonAccelerator came from - must have been from something I tried to get this working!

So the biggest problem is now overcome however I still have 2 issues:

- The screen rotation dropdown does not appear, I can't seem to find any information on why this would be?

- "3D" effects are quite slow chess / safari new tab, etc

PS: GraphicsEnabler=No doesn't appear to be any different than Yes now. Both have 3 screens, poor performance and no rotation