Hi I have an white Macbook (+/-2007). Last week it won't boot anymore. When I press the power button the screen flashes white very quickly and the Fan almost begins to turn. I have replaced the battery pack, RAM. The Hard-drive is still good (I've recovered my data via external enclosure). Yesterday I disassemble the case to see if a wire was lose or something had burn, but everything looks OK..!! Can someone help me?