I've had my Macbook since last Tuesday and I love it (2.0 GHz, white, 1GB ram). I haven't had problems running any programs and Windows runs great on it (although I'm not a fan of windows).

Several times, over the last week, it wouldn't turn on. I could understand this if the battery was drained but there were times that it was at about 50%. On top of this, I would plug the A/C adaptor into it and it still wouldn't turn on. It doesn't mak a difference if it's been off for 15 minutes or a few hours.

I end up holding the control, command and power buttons and it will start up. I don't feel like I should be doing this every time I turn it on. Once on, it works like a charm.

Has anyone else had this problem? Could it be a defective battery?