HT201257: Using Apple Hardware Test
Learn about Using Apple Hardware Test
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Helpful answers
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Feb 9, 2016 6:51 PM in response to ydressby rkaufmann87,It would be helpful if we knew what version of OS X is installed on the computer. If it's 10.7.x or later, the try to restart into the Recovery Partition (Command + R) and then open Disk Utility and run either Repair Disk or First Aide. If errors appear that means the HD has crashed and needs to be replaced.