Apple HW Test error code -3403d

Discussion in 'OS X Mavericks (10.9)' started by pvlucasz, Nov 19, 2015.

  1. pvlucasz macrumors newbie

    Nov 19, 2015

    I'm currently trying to run an apple hardware test on a mid 2010 21.5" iMac running osX Mavericks as the iMac is running very slowly so I suspect a HDD failure is imminent.. Upon pressing (option + D) on start-up i'm greated by the image of a globe with it trying to connect and download. then being displayed with the error code -3403d. I have already searched the forums for this error and no one has gotten a reply, so I thought i'd start a new thread and get it to the top of list. I have made sure i am connected to my network, i am using an ethernet cable to do this. I can boot into recovery mode with (command + option + R). I have tried running first aid on both the HDD itself and the partition that MacOS is installed on.

    Any help would be greatly appreciated.
  2. CoastalOR, Nov 19, 2015
    Last edited: Nov 19, 2015

    CoastalOR macrumors 68020


    Jan 19, 2015
    Oregon, USA
    I think that error code means that AHT can't be located. You need to run AHT from the 10.6 Applications Install Disc 2 that came with your iMac.
    Here are some instructions:
    Here are some step from the above link:
    Using Apple Hardware Test on computers with OS X v10.7 and earlier:
    1. To start AHT on these computers make sure the Applications Install Disc 2 is inserted into the built-in optical drive

    2. Shut down your computer. Then, press the power button to turn it back on.

    3. Press and hold the D key before the gray startup screen appears.

    4. It takes a minute or so for AHT to start up and inspect your hardware configuration.

    5. When the process is complete, select your language and click the right arrow. If you aren't using a mouse, you can use the up and down arrows to select a language and then press the Return key.

    6. The AHT console appears. You can choose which sort of test or tests to perform:
    To perform all of the basic tests, click the Test button or press the "T" key or the Return key.
    To perform a more thorough diagnostic test, select the "Perform extended testing" checkbox under the Test button before you click the Test button.
    Note: Your test results will appear in the window in the bottom-right of the console.

    7. To exit AHT, click Restart or Shut Down at the bottom of the window.

    Apple Diagnostics: Reference codes:
  3. pvlucasz thread starter macrumors newbie

    Nov 19, 2015
    Hi Coastal,

    Thanks for your prompt reply. Unfortuantely for me I no longer have the discs that came with the iMac. Is there anywhere i can download the discs or a copy of the Apple Hardware test that can be ran standalone? I'm not sure if this exists. If worst comes to worst I'll have to flatten and reinstall. It's just annoying as I think there maybe an underlying issue with the hardware. I'm experciancing some serious stability issues. I have other diagnostics software for normal PC's but unfortunately it doesn't run on Mac's.

    Any further help would be greatly appreciated.
  4. CoastalOR macrumors 68020


    Jan 19, 2015
    Oregon, USA
    Well, I understand AHT can be downloaded from github. I have not done this or downloaded from them before so you are on your own, but it is the only download option that I know about.

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3 November 19, 2015