I don't know if it can help, but it boots in this sequence:
1. We see all these stuff scroll on a black screen
2. NITDroid boot screen shows up, with the matrix style letters falling down behind
3. While this boot screen is still up, the red led starts flashing
4. NITDroid boots, led still flashing, at first I can see on the upper left: preparing sd card
5. Then, it writes sd card is now safe to remove
6. Then, everything shuts down...!
P.S. During the whole time, the battery is red with a bar on it like if it was empty. In maemo, it shows up nearly full! I tried with 2 different batteries and it's the same thing so I'm certain that the battery's not the problem.