i have the same problem like you guys, red led blinking and n900 turns off. i think it's because your charging chip, or what it is?, is fryied so nitdroid can't check your battery level and it's showing red led like it's empty. that's what happens with my n900. but if you connect your n900 via service pins (there is post somewhere on maemo.talk) to charger, nitdroid will work. i get it worked that way.