Hello, I cannot find anyone who has gotten around this yet. I have a Lenovo Y550P and I have a feeling a wide variety of notebooks and desktops alike may experience this. So, after trying several different USB thumb drives, re-downloading ML from the Mac App Store twice, and trying several different boot flag combinations, I give up. I just spent $20 on this and I really want to get it working. Hardware: i7-820QM NVIDIA GeForce GT 240M 480GB Corsair Force 3 SSD 8GB DDR3 RAM Issue: With or without -v flag, it boots the installation successfully (I believe) yet my screen is completely black. I have hooked up my laptop via HDMI to see if my external monitor would work. I tried GraphicsEnabler=No -v -x PCIRootUID=0 Also, GraphicsEnabler=No -v -x PCIRootUID=1 I have replaced nearly every component on this machine except for the CPU and GPU to be compatible thus far. Here is a video of the final seconds on a verbose boot: Mountain Lion 10.8 UniBeast black screen installation - YouTube I have made sure I followed all the steps in the guide. Anyone with this similar issue or outside advice? I have gotten this laptop from 10.6.8 to 10.7.4 with relative ease and now I can't even boot the installer for ML.