Hi, i heard on fixit website to try to boot after removing HARD DISK - that might solve the problem as it will force it to boot from a usb or cd version of OS system - It hasn’t worked for me, but that might help someone else - good luck to you.I still cant fix my MacBook 17inch - flashing question mark, wont load, or go to disk utility - goes to apple with the USB software, but then goes to WHITE SCREEN OF DEATH - and nothing! :(