Doug Stringham
Level 3 (706 points)
Desktops

Q: Apple Diagnostics won't start on mid-2010 27" IMac

Attempting to trouble-shoot a mid-2010 27" iMac. Originally thought it was the graphics card. Took it to the Apple Store and they thought it was probably the video card as well. But as the iMac is too old they couldn't send it in for repair. So I purchased a replacement card online and installed it yesterday. Identical issues. Very unlikely that both video cards would have the exact same issue. So now I'm beginning to wonder if it's RAM related.

 

Trying to fire up Apple Diagnostics by holding down 'D' when starting the machine only delays the regular boot to login. Diagnostics never boots up. Holding down Option-D will go through the download procedure, but once it finishes and you attempt to run the app it tells me that it won't run on that particular machine.

 

So I'm stuck.

 

Anyone know where I can download the diagnostics software and do this directly??

 

Apple Support on Twitter is being less than helpful.

iMac, OS X El Capitan (10.11.6), 27" mid-2010 iMac

Posted on Aug 21, 2016 11:07 AM

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Doug Stringham

Q: Apple Diagnostics won't start on mid-2010 27" IMac

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  • by Michael McCranie,

    Michael McCranie Michael McCranie Aug 21, 2016 11:16 AM in response to Doug Stringham
    Level 3 (543 points)
    Mac OS X
    Aug 21, 2016 11:16 AM in response to Doug Stringham

    I would try Ogelthorpe's lead. It tests storage media capabilities, just stuff like the RAM, CPU, GPU, video, etc.

     

    Using Apple Hardware Test - Apple Support

    "Using Apple Hardware Test on computers with OS X v10.7 and earlier

    AHT is located on the Applications Install Disc 2 and should be included with your computer or the MacBook Air Software Reinstall Drive on a MacBook Air (Late 2010). To start AHT on these computers make sure the Applications Install Disc 2 is inserted into the built-in optical drive, external Apple Superdrive, or for the MacBook Air (Late 2010) be sure the MacBook Air Software Reinstall Drive is inserted into a USB port. Then, follow steps 1-6 outlined in the previous section of this article."