fc14->fc15 via preupgrade hangs during first boot

[Monty Clift]

hi all,i have just upgraded from f14 to f15 using preupgrade.  i am now still waiting for the first boot to finish.  the screen is stuck for more than an hour and the last line written was:
Started LSB: Start up the OpenSSH server daemon.
and there is a blinking cursor.
any help will be much appreciated.monty... 
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