OS X Yosemite: If you think you have incompatible login items
Login items are apps that open automatically when you start up or log in to your Mac. Occasionally, a login item may cause a blank blue screen at startup or other problems.
in the Help window, then choose Print. Test your login items
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Choose Apple menu > System Preferences, then click Users & Groups.
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Click your account name below Current User, then click Login Items.
Make a list of the login items—you’ll need to remember them later.
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Select all of the login items, then click Remove
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Choose Apple menu > Restart.
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If this solves the problem, open Users & Groups preferences again, add the login items one at a time, and restart your Mac after adding each one.
When the problem occurs again, follow the steps above to remove only the last login item you added.