This happened to me today. I installed a bunch of stuff, so I can't say for sure what caused it. I rebooted (one of the things I installed was the latest version of maemo-mapper which was segfaulting. Thought a reboot would help), and the blue line stopped at the end and the thing just sat there.

I ended up reflashing ... took most of the day to get back where I was, but at least its running again.