When the N900 is blocked, the loading dot animmation is still working during 5-10 seconds, then after stop.

I try to restart the N900 after this, but i have an infinit dot animmation, and the device never finished to boot.

Is there a way to see detailed boot steps on N900?
To know what is the faillure... like when we have with the <ESC> on ubuntu linux boot.