This is updated kexts for OS X10.9 Mavericks , install it like another text and boot using GraphicsEnabler=Yes .
NOTE : I do not issue any guarantee that this will work for you! use google for other troubleshooting
1 . Figure out your graphics device ID
- about this mac
- more info
- system report
- click on graphics/displays from left sidebar
2: delete all ATI and AMD related Kexts and injectors EXCEPT these
- AMD5000Controller.kext
- AMDFramebuffer.kext
- AMDRadeonVADriver.bundle
- AMDRadeonX3000.kext
- AMDRadeonX3000GLDriver.bundle
- AMDSupport.kext
3 :Add your Device ID to ATi5000controller.kext and ATiReadeonx3000.kext.
- GO to System/Library/Extensions
- then find one of the above Kexts and show package contents
- Contents
- add you dev id to info.plist under IOPCIMatch
updated fixed kexts
set GraphicsEnabler = Yes
if still problem persists then try
AtiConfig=Eulemur
Repair permission through kext utility
reboot