I have a T400 and have run into some problems with this method. First off, I know my CD/DVD drive is on its way out, it sometimes works and sometimes doesn't. Second, I don't have an external drive (not sure if this is what is causing the problem). So I do everything, but use my laptops drive. It gives a 3 "Ebios read error: Device timeout error", but then it loads the bootloader and shows my MacOSX USB. When I select the USB it freezes up during startup, if I use -v -x it stops at:

Couldn't alloc class "Disabler"
22IOACPIPlatformDeviceCh is not compatible with its superclass, 20IOACPIPlatformDevice superclass

Is this because I am not using an external drive?