My macbook pro keeps booting up, then after a few seconds, goes back to the sign in page. This happened after I was doing software updates and my computer restarted in the middle of an update. Help! Thanks.

My macbook pro keeps booting up, then after a few seconds, goes back to the sign in page. This happened after I was doing software updates and my computer restarted in the middle of an update. Help! Thanks.

Start up in Safe Mode.
http://support.apple.com/kb/ph14204
Repair Disk    Section: "Try Disk Utility"
http://support.apple.com/en-us/HT203176

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    If I were in your shoes, I would startup in Safe mode by depressing Command-Shift key. You continue pressing those keys until the Apple Logo appears aith a startup progress bar underneath. After it starts up, go to SystemPreferences/Users&Groups and select your user account:Login Items and remove all of them (noting so you can add them back afterwards. And reboot.
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    Aug 13 12:58:37 Ben-Shepards-MacBook-Pro loginwindow[31]: loginwindow SleepWakeCallback will power on, Currenttime:8/13/2010 12:58:37.034 PM - Waketime:8/13/2010 12:58:35.400 PM = Deltatime:1.633561075
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    Aug 13 13:00:50 Ben-Shepards-MacBook-Pro configd[13]: network configuration changed.
    Aug 13 13:00:53 Ben-Shepards-MacBook-Pro loginwindow[31]: loginwindow SleepWakeCallback will power on, Currenttime:8/13/2010 1:00:53.031 PM - Waketime:8/13/2010 1:00:51.420 PM = Deltatime:1.611223936
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    Aug 13 13:00:53 Ben-Shepards-MacBook-Pro configd[13]: PMConnection AirPort configd plug-in com.apple.powermanagement.applicationresponse.slowresponse 128 ms
    Aug 13 13:00:53 Ben-Shepards-MacBook-Pro configd[13]: PMConnection IPConfiguration com.apple.powermanagement.applicationresponse.slowresponse 130 ms
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    Aug 13 13:05:42 Ben-Shepards-MacBook-Pro configd[13]: network configuration changed.
    Aug 13 13:05:44 Ben-Shepards-MacBook-Pro loginwindow[31]: loginwindow SleepWakeCallback will power on, Currenttime:8/13/2010 1:05:44.024 PM - Waketime:8/13/2010 1:05:42.410 PM = Deltatime:1.614192009
    Aug 13 13:05:46 Ben-Shepards-MacBook-Pro configd[13]: Sleep: Success - AC 98 - Clamshell Sleep
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    Aug 13 13:05:51 Ben-Shepards-MacBook-Pro mDNSResponder[30]: RegisterInterface: Frequent transitions for interface en1 (FE80:0000:0000:0000:0223:6CFF:FE96:9643)
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    Aug 13 13:06:24 Ben-Shepards-MacBook-Pro ntpd[18]: time reset -0.427840 s
    Aug 13 13:06:41 Ben-Shepards-MacBook-Pro loginwindow[31]: no spins reported for this wake
    Message was edited by: Shep123

    I just found this link and have followed the instructions. Here's hoping...
    http://discussions.apple.com/thread.jspa?messageID=11716177&#11716177

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