I can run a hardware diagnostic and this returns no issue. I can get to the spinning globe, connect internet and upon progress bar completion the machine hangs. I am also not able to enter either internet or system recovery mode. In each case above I am presented with the screen attached for a quick few seconds and then the machine continues to boot to the log in screen. Nor does entering via verbose mode (cmd v). Now I know the file vault is enabled and I need to disable that however I cannot do that as the combination cmd s also does not work. The issue here is I cannot get the machine to enter single user mode using cmd rs. I have gone through the steps of resetting PRAM and SMC. This isn't always the case however and I now need to disable the discrete card from the command line. I understand if I log in using the discrete and the machine gets as far as the white screen when user log in should complete and the machine restarts, the integrated card is defaulted at next boot.
To actually log in however it is a lengthy cycle of restarts and reboots so the machine uses the integrated card after boot. I can use gfxCardStatus to switch the cards after logging in if I can get that far. I originally went through the graphics card recall for this machine however as expected the replacement discrete card has now failed again. As per the title I am attempting to disable the AMD discrete card so the machine uses only the integrated card.