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May 27, 2015 9:40 AM in response to Bydwby D.Cohen,Follow the steps suggested by Apple in this article:
https://support.apple.com/en-us/HT204267
Hope this helps! -
May 27, 2015 9:42 AM in response to Bydwby dominic23,Start up in Safe Mode. http://support.apple.com/kb/PH18760
Reset PRAM. http://support.apple.com/kb/PH18761?viewlocale=en_US&locale=en_US
Repair Disk. http://support.apple.com/kb/PH5836
Hope you have backed up the computer.
Reinstall OS X.
http://support.apple.com/kb/PH18872?viewlocale=en_US&locale=en_USHop