Okay, so this happens occasionally on my iBook G4(the last one). But It would go to sleep and sometimes I wanna wake it up. I can hear the little mechanical movment on the inside but the screen never comes on. Then I hold the power button to turn it off and its all good. When I power it on, The spinning gear crashes on the 3rd or sometimes 7th spin. If I keep restarting it, it will eventually start working again. But its so embarassing when I am in class and the apple start up noise is coming out like 50 times before I can get it run. What should I do?