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iMac Diagnostic shows white screen only

Hi all,


I tried running Apple diagnostic (bootup hold onto D key). But it only shows a blank white screen after I hear the Chime sound.


What is going on? Please advice.


Device: iMac 24" (Late 2012)

OS: 10.14.1


Thank you

iMac, macOS Mojave (10.14.1)

Posted on Nov 28, 2018 6:33 PM

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Posted on Nov 30, 2018 6:14 PM

Your Late 2012 27” (not 24”) iMac uses the Apple Hardware Test not Apple Diagnostic. Try running AHT over the internet by holding Option-D at startup How to use Apple Hardware Test on your Mac - Apple Support

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iMac Diagnostic shows white screen only

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