I've got a problem, and I'm hoping you all might be able to help.

My laptop has shut down on it's own three times. Each time it shuts down, it's as if the battery was removed--instantly off. I've also been watching video each time. Twice on hulu, once was vimeo.

The first two times were one day after another, and the third just now, was a week later.

So if anybody has any ideas on what might be wrong, I'd really appreciate it. The laptop should still be under warranty but I'd love to not leave it with best buy for four weeks.

Thanks!