![]() Update – May 26: The AHT partition is actually mounted from a disk image stored in the factory-supplied Recovery HD partition. However, if the AHT partition is not available and you have an internet connection, you can use Internet Apple Hardware Test. From there, you can use the available tool to (hopefully) diagnose hardware problems on your Mac. Apple now ships most Macs with a hidden AHT partition, which allows you to hold down the D key at startup to boot your Mac using the AHT partition. ![]() Internet Recovery lets you start your Mac directly from Apple’s servers using a NetBoot-like process and gives you the same functionality as Recovery HD does.Īpple also made Apple Hardware Test (AHT) available in a similar fashion. If you encounter a situation in which you cannot start from the Recovery HD, such as where the internal hard drive has failed or when you’ve installed a new disk without an OS on it, Mac models that were released after July 2011 can use Internet Recovery. One of the new features that appeared with Macs that shipped with Lion was Apple’s Internet Recovery.
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