i have had this problem in the past and sent my notebook to apple for repair. does anyone know what is causing this... before my macbook would just "blink" off and i could restart it then eventually it would not even start. now the problem is different the os is often displaying the shut down restart menu at random times. entering cancel sometimes it stops and sometimes the menu reappears multiple times. and twice the cpu has even "blinked" off. i have noticed some relationship with the track pad as the unwanted menu appears repeatedly whilst touching the pad or clicking the key. (especially if heavy force is used) any idea what is source of my problems?