Holding down "D" no longer starts Apple Hardware Test! Any idea what's happened and how I fix it? Or do I need to go to the Genius Bar? MacBook Pro with Lion Preinstalled.

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Holding down "D" no longer starts Apple Hardware Test! Any idea what's happened and how I fix it? Or do I need to go to the Genius Bar? MacBook Pro with Lion Preinstalled.

I have a MacBook Pro with Lion Preinstalled, so AHT was present on the hard disc and worked when the product was new. One of the first things I did from new was run AHT and it worked fine. But now it doesn't start - instead the machine (eventually) boots into normal OS X.

Holding down "D" no longer starts Apple Hardware Test! Any idea what's happened and how I fix it? Or do I need to go to the Genius Bar?

Software Mac OS X Lion 10.7.3 (11D50b), if it makes any difference.

Any ideas?

MacBook Pro, Mac OS X (10.7.3)

Posted on Feb 28, 2012 1:08 AM

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Answer 1

ds store

Level 7

30,855 points

Feb 28, 2012 1:23 AM in response to ABMorley

Yes, make sure you have a Internet connection first, then reboot holding the D key and wait for it to be downloaded, takes forever.

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Answer 2

ABMorley Author

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Feb 28, 2012 11:43 PM in response to ds store

Thanks. However, even with an internet connection that doesn't work for me - the machine just (after an extended delay) boots normally. It doesn't download.

Option-D works for an Internet-based AHT. However that only works with an internet connection. It doesn't seem to download it and install it - it needs internet every time.

Any idea how my local copy of AHT disappeared? I haven't repartitioned the drive or knowingly deleted anything. And how do I reinstate it (because if you need AHT your hardware problems may preclude internet access!)?

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