So I'm trying to run the Apple Hardware Test. I start the computer up and hold "D". It boots into OS X like a normal startup. So, I plug in the Ethernet and hold option-D to do the AHT from the Internet. It tells me "Apple Hardware Test does not support this machine".

So, I try to install the "iMac EFI Update 1.8" from http://support.apple.com/kb/DL1493 (which is for my iMac model, which is a iMac (Mid 2010)), but it says "This software is not supported on your system." I also tried the later version, v1.9, from http://support.apple.com/kb/DL1498 but it isn't for my iMac and so I get the same error.

I also tried putting in my DVD 1 for my iMac, then starting up by holding both "D" and "option-D", but neither booted AHT from the DVD.

So now I'm stuck. What should I do now?

  • Do firmware updates like these EFI updates give that "This software is not supported" message if you run them on a system where they're already installed?
    – rakslice
    Commented Sep 9, 2017 at 5:48

2 Answers 2


Do you have another mac? Can you boot the problematic machine in Target Mode (boot holding the T key). Connect to the other mac and run system utilities (Disk, etc) from there.

What is the problem with your computer that requires you to run AHT?

Hope this helps.


Okay, so I finally got it working by inserting DVD 2 rather than DVD 1. It clearly indicated on the DVD that it has Apple Hardware Test, which I missed the first time. This could be useful to those who have a similar problem to mine, I suppose.

  • Brilliant!! I've been trying to get into AHT for 2 days now and made the same mistake, popped in the second disc and all done in 15 minutes - marvellous!
    – user37609
    Commented Dec 31, 2012 at 15:23

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