I am trying to upgrade my macbook pro to os x mavericks, but it has been on the reboot process for more than 2 hours. There is only the apple logo with the spinning ball thing. What should I do?

I am trying to upgrade my macbook pro to os x mavericks, but it has been on the reboot process for more than 2 hours. There is only the apple logo with the spinning ball thing. What should I do?

Hi there Candyleehoiman,
I would recommend taking a look at the troubleshooting steps found in the article below.
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
-Griff W.

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