I have a similar problem. Constant "reboot". Tried the procedure above but no luck. Still rebooting. Tried it with the electrical charger and the USB connection.
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Could you help us by explaining your issue from the beginning?
Did an update, BB asked to reboot, I did. On reboot white screen with timer clock, then screen went black/blank and red light was flashing. Reboot process is continual.
Sounds like it might be nuked. What update were you installing?
Here is a guide that should hopefully help explain how to unnuke it.
http://www.blackberryos.com/forums/b...-pictures.html
Or just reinstall OS..!