normally a blink ligth in a blackberry mean a failure of the Operative System in the equipment, if you have time and pacience you can fix it
the pth to follow its this:
Download the blackberry Operative System to your cel dont forget check of your blackberry, sample Blackberry Storm 9500 from At&T, search in the blackberry page the Especific Operative system to blackberry storm in at&T
from this page you cand find it
BlackBerry - BlackBerry Desktop and Device Software Download Sites
The efter you have the os you need download the Desktop manager.
Install the DM and then install the S.O of your cell, after all you need conect you BB an then install the OS , good look