HT202731: Using Apple Diagnostics
Learn about Using Apple Diagnostics
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Helpful answers
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Feb 5, 2016 6:23 AM in response to resonator55by mende1,Sometimes Apple Diagnostic may not be able to detect an issue, even if there is. In this case, I suggest you to make a backup of your files and take your Mac to an Apple Retail Store. From what you say it looks like something strange is going on with the screen.