I can not get to the installation menu from the osx 10.10 or 10.10.1 using usb flash drive. I have the flags that you showed in the guides for amd kernels. Like amdfx or amd64. I have been using the mavericks on the build for quite a long time. Thought updating it. But not working. Need help My Specs AMD FX 4100 3.60 gHZ Gigabyte m78 usb 2 motherboard 8gb DDR3 1333 MHZ Ram nVidia gEforce gt 240 1GB graphics.