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Sep 24, 2014 8:47 AM in response to Vader5229by norm123,Hello Vader5229
If you are unable to power off your computer, then hold the power button on your MacBook for about 5 seconds and it should power off. Then turn it on and try your software update again.
OS X Mavericks: Using the power button
http://support.apple.com/kb/HT5869
Regards,
-Norm G.
