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format NameNode after reboot

I was using Hadoop 1.0.4 in a single-node mode and everything was working
fine.But then I had to restart my computer because of some reason.And now
when I am trying to start Namenode and Datanode I can find only Datanode
running.Could anyone tell me the possible reason of this problem??Or am I
doing something wrong?? I tried both bin/start-all.sh and bin/start-dfs.sh.

. Many thanks in advance