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Helpful answers
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Apr 14, 2015 3:36 AM in response to niecy4pcby kaz-k,Resetting SMC as well as NVRAM could solve the problem
Or boot in single mode, then
Go to /Users/Your name/Library/Preferences, then delete following file and reboot could solve the problem.
com.apple.finder.plist
com.apple.sidebarlists.plist
Mac OS X: How to start up in single-user or verbose mode - Apple Support