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Apple removed the obsolete AHT page

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Claude Becker 2014-12-05 17:10:10 +01:00
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Apple computers ship with a pre-installed suite of hardware diagnostic tools, known as Apple Hardware Test (AHT). In principle you can start them by holding the ``d`` key while booting. Newer models support holding ``option d`` to load AHT over the internet. Refer to the official Apple documentation for details: Using AHT on [Intel-based Macs](http://support.apple.com/kb/ht1509), [Mountain Lion](http://support.apple.com/kb/PH11342), [Mavericks](http://support.apple.com/kb/PH14291) and [Yosemite](http://support.apple.com/kb/PH18765). Apple redesigned the AHT, now called [Apple Diagnostics](http://support.apple.com/kb/HT5781), for Macs introduced after June 2013.
If however, you reinstalled an older computer from scratch, the diagnostic tools might no longer be available. Unless you have the original disks that came with your computer, there seems to be no way to restore the AHT, as the [official AHT](http://www.info.apple.com/support/aht.html) page only contains information about ancient computer models.
If however, you reinstalled an older computer from scratch, the diagnostic tools might no longer be available. Unless you have the original disks that came with your computer, there seems to be no way to restore the AHT.
It happens that Apple provides disk images with AHT for most computers, but does not make the links publicly available. Various blogs and forums, mostly [Riven by Five](http://rivenbyfive.blogspot.ch/2012/01/download-and-run-apple-hardware-test.html) and [MacForum.ro](http://arhiva.macforum.ro/comunitate/topic/1194-apple-hardware-test/) have gathered a list of download links. The rest were obtained by scraping `http://download.info.apple.com/Apple_Hardware_Test/` for all the links of the form `0(18|22)-\d{4}-A.dmg`.