New MBP won't turn on unless it's on AC power

So, my new MBP won't power on unless it's plugged in. It had 80% charge left. The sleep/wake light was on, but the keyboard was unresponsive and the screen remained off. This happened out of the box, so I charged it, and thought that was it. This morning it did the same thing again. But NOW it seems to be working again. I'd hate for this to happen again, after I can return it. I've tried to replicate the problem but to no avail. Any ideas?
The wake on AC power is not an issue here.

I've had my Macbook for 2 months now. Yesterday VLC was whining that my CPU wasn't fast enough to run a video. Then about 1-2 houras after when I was opening a video in VLC it just froze. After wondering what happened a screen appeared telling me to restart computer and how to do it in 5 languages, the screen also had some color lines in it. OK so I shut it down and turned it back on.
Then it flashed blue screen for less than second and then the screen was all black. Fan was running and the led in front panel was on. Also it doesn't keep the umm..starting sound and doesn't respond when I press the keys (or at least num/capslock won't turn on). Now it just keeps doing that all the time I try turning it on.
I tried resetting PMU but didn't help. I don't have Tiger CD's here so I can't try starting it with them. I wonder what broke up, guess I'll have to take it to Apple authorized care.

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