Last saturday I was chating thru Skype when my battery ran out, I changed the battery, as I have 2, and the N900 never started again. It turns on, the Nokia logo shows up with a vibration, stays like that for 3 seconds and restart, after a few reboots the words "malfunction the device will shut down in 10 seconds" shows up. I tried to flash it but the massage that the image has a different lenght, then I managed to put it in "rd mode", a sign appears in the midle, and aftwards the device info, but after unplugging the usb cable, it starts rebooting again, with the sign and the device info, I take it off the "rd mode", and nothing different happens. Note: the blinking dots of the initializaton of the phone never appeared. Any one can help?

I had similar, helped for me: http://talk.maemo.org/showpost.php?p=745541&postcount=2