I'm using macbook1,1. Previously I used both mac osx,tiger and win xp operating systems. yesterday, I tried to remove winxp. I dont know what happened suddenly my laptop stopped recognising internal hard disk. When i'm starting laptop its showing white screen, nothing else. When I keep mac OS dvd its processing but not showing hard disk. I searched in disk utilities there also not able see any hard disk detection. I'm not able to understand what happened. please help me?