Here's a guide for people who got "starting kernel" heng with power44.

http://my.svgalib.org/770/n900/u-boot/u-boot-n900.zip

1 - Expand attached archived on SD (must be on third Fat partition)
2 - Start N900 and enter on u-boot interactive console (by booting with open keyboard and pressing any key).
3 - Type mmc init and press enter
4 - Type run loadbootscript and press enter
5 - Type run bootscript and press enter

This should run maemo with stock PR1.3 kernel (included in the zip file).

After booting I suggest downgrading to power43 kernel with the command (as root):

apt-get install kernel-power=2.6.28-maemo43 kernel-power-modules=2.6.28-maemo43 kernel-power-flasher=2.6.28-maemo43

And I request that people will tell me about having this problem, including the HW revision of their device.