Failed update from F18 to F19

[Paolo Galtieri]

I tried to update my F18 system to F19 using fedup.  I followed the 
instructions in the user guide for doing the upgrade.  Fedup completed 
without errors so I rebooted to complete the upgrade. When I rebooted th 
system it displayed a progress bar which after several hours never 
changed its display.  I tried to reboot and try it again, but I now have 
a dead system.  After I boot all it shows is a blinking cursor.  So what 
do I have to do to recover my system?

Paolo