Had my Storm 9500 for about 6 months, problem free.
Alarm went off on phone as usual this morn and was on for a while. Next time I picked it up it had the white screen and small black box with the timer inside (the boot screen). It has done this before (randomly rebooting) so I left it. An hour later it was still trying. I have done about 10 battery pulls at various stages of 'boot' andi hasnt made a difference. Have also charged phone.
Sure sounds like a nuked OS! Follow the instructions in that 101 that AZ posted. ALSO here a slightly more complicated, but more robust way to fix it, IF that does not work.....