After a power cut my machine cannot boot

[Paul Smith]

Dear All,

While doing

yum update

on a F21 machine, there occured a power cut. And now I cannot boot the
machine, and when I use the rescue mode and try to run again

yum update

I get the following error:

"/lib64/libidn.so.11: file too short".

Any ideas? I have already tried to get the libidn rpm from a repo, but
again I get the same error with wget ("/lib64/libidn.so.11: file too
short").

Thanks in advance,

Paul