I have a old maybe 2007 white macbook non unibody a1181 model. It takes about 15minutes to boot up. It boots normal but when it goes from the gray apple screen to the blue screen it sits on the blue screen for about 15 minutes. Then it takes me to my home screen like nothing happened. I assume it has nothing to do with my hard drive because I've tried several different drives and same thing. I've also tried swapping out the ram. I did a SMC and PRAM reset as well. Does anyone have any ideas? Thanks in advance!