White screen during shut down on iMac after installing maverick

After installing maverick my imac cant shut down and it stuck on white screen , and i have to push the turn on button every time to switch it off.
I have an imac with osx 10.9, 3,06GHZ Intel core i3 with 8gb 1333MHZ DDR3 ram.
Any idea what is going on and what to do to fix the problem?

Alos posted another place.
I have had the same problem, and connected it to a problem with Western Digital HD software.  I use an external WD HD for time machine purposes.
I then uninstalled all the HD software, and it now seems everything works fine.  You may try this. Ref this article:
http://www.infoworld.com/t/storage/os-x-mavericks-upgrade-destroys-data-reports- western-digital-230100

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