OS = 10.8.4 I have a MBP with an i5 and the dual GPU IntelHD/NVidia GeForce GT 330m I have downloaded the gfxCardStatus app in hopes of overcoming an issue I am having with a MBP. I would like to force the MBP to use the NVidia graphics only (both on battery and plugged in) and disable Automatic Graphics Switching. Whenever I attempt to set it as discrete only through the gfx app my system crashes. Also if I just go right to the enregy saver options and uncheck Automatic graphics switching the mbp crashes as well. Black screen and then auto restart. I can recreate this issue whenever I use an app that switches from the Intel HD graphics to the NVidia. In safeboot it starts up with discrete/NVidia and the Automatic graphics switching is disabled, the machine runs perfect this way but as soon as I boot into normal mode it reverts back. Is there anyway I can force discrete/Nvidia only preboot and keep those changes. I attempted to force discrete only in safe boot with gfxCardStatus, set gfxCardStatus to launch on startup, but as soon as I boot into normal mode it shows that the Intel graphics are running instead. Also I am aware that there is an actual hardware problem with the logic board but if I could get Automatic Graphics Switching disabled before Mac OS loads I can work around it. Also I have downloaded the most up to date Nvidia CUDA drivers and all Mac OS updates. I have also attempted pmset in terminal but this does not change anything "sudo pmset -a gpuswitch 0" I tried 0,1, and 2 not knowing which was which, still no go. Any help would be greatly appreciated.