HT202731: Using Apple Diagnostics
Learn about Using Apple Diagnostics
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Helpful answers
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Dec 10, 2015 8:40 AM in response to Vishalkrgby CPUBot,HT202731 is a support article on Apple Diagnostics. It was a good idea to test for the hardware but most likely this is a software issue if you can log into the Guest user.
Try logging into your Admin account with Safe Boot. Try safe mode if your Mac doesn't finish starting up - Apple Support