Hello guys, i'm noob. My notebook specification Acer Aspire V5-471G Intel Core i3 CPU ivy bridge (ULV) DDR3 4GB RAM Bux 1333Mhz Optimus Technology Intel HD 4000+ nVidia GeForce 620M 1GB VRAM I've installed Mountain Lion on HDD via USB boot, but i can't boot into normanl mode. i've copy NullPowerCpuPowerManagement.kext and FakeSMS.kext frome USB boot into System/Library/Extensions/ and then deleted AppleIntelHD*, Geforce*, ATI*, NVD* in System/Library/Extensions/. I use boot flag: GraphicsEnable=No -v -x, my computer boot into safe mod ok, but when i use boot flag GraphicsEnabler=no -v, i got this log: Please give me some help and thanks After installed, boot with USB boot again, launch Terminal and type: cp -R /System/Library/Extensions/NullCPUPowerManagement.kext /Volumes/"OS X pattition name"/System/Library/Extensions/ cp -R /System/Library/Extensions/FakeSMC.kext /Volumes/"OS X pattition name you have install'/System/Library/Extensions/ and then type: reboot to safe boot, go to System/Extensions delete kext: NVDAGF100hal.kext NVDAGK100hal.kext NVDANV50hal.kext NVDAResman.kext NVSMU.kext it's worked fine. add io-platform-id and drop ssdt. May notebook full QE/CI and Power Management, Speed Step.