I'm not using an SSDT. Maybe I should be, but I don't have any issues booting up. What's your bootloader? Are you using Chimera from Multibeast or Chameleon?
Also, are you using either the MacbookPro8,1 or MacbookAir5,1 smbios plist? Multibeast defaults to using MacPro3,1 but it's not right for...