Hi. I was just using my Dad's MacBook 1.83 GHz. It just randomly switched off. I thought OK, maybe the battery was very low and I hadn't noticed. But I have checked the battery by pressing the button on the bottom of the laptop; but it is full. I plugged the MagSafe power cord in and pressed the on button. All it does is put the fans on lowest setting, turns and keeps the power light on, and that's it. Nothing else at all. Is it bust? Should I take it into the local Apple Service Store? Is there something I can do? Is this a known problem with a few MacBook's? Thanks! Please be quick!