| Flag | Description |
|---|---|
| -v | Verbose Mode |
| -x | Safe Mode |
| -s | Single User Mode |
| -no-zp | Zone Postponing (use if hanging) |
| cpus=1 | Single CPU Core Mode |
| -f | No Kext Cache Mode (use if hanging) |
| dart=0 | Disables VT-x or VT-d |
| nvda_drv=1 | Enable NVIDIA Web Drivers |
| nv_disable=1 | Disable NVIDIA graphics cards |
| kext-dev-mode=1 | Kext Dev Mode |
| rootless=0 | Rootless Mode (Yosemite Only) |
| npci=0x2000 | If you're stuck at [PCI Configuration Began] |
| npci=0x3000 | If you're stuck at [PCI Configuration Began] |
| maxmem=4096 | Set Maximum Memory (MB RAM) |
| maxmem=8192 | Set Maximum Memory (MB RAM) |
If you are having any trouble, first try this string. It works on a lot of systems with Intel HD Graphics to get into the OS X Installer from a Unibeast USB.
-v -x -s -no-zp
If you have an NVIDIA Desktop GPU, use this string to boot into the installer:
-v -x -s nv_disable=1
If all else fails, or you don't know where to start, use this string:
-v -x -s -f cpus=1 maxmem=4096 nv_disable=1 -no-zp
If you have an NVIDIA Desktop GPU and you've installed NVIDIA Web Drivers, use this string:
-v nvda_drv=1