Get Apple Hardware Test Boot Mode Back on Some OS X Lion Macs

Mac OS X Lion has changed how several helpful troubleshooting tools function, one being the reset password tool, and another is how Apple Hardware Test (AHT) mode works. Gone is AHT’s independent boot mode in favor of an internet based version that is dependent on Lion’s Internet Recovery instead. If you always have access to the internet, this isn’t a big deal, but if you can’t get online that’s not particularly useful.
There’s a solution, for some Macs at least, and that is to copy the old Apple Hardware Test utility over to the Mac OS X Lion boot drive, which enables you to boot up from AHT by holding down the “D” key as usual. The catch? You’ll need a pre-Lion Mac that came with the Mac OS X Installation and Application install disks, yes, the DVD, from 10.6 or otherwise. This obviously rules out some of the newest Macs like the 2011 MacBook Air and Mac Mini from restoring onboard AHT, but it will work to restore the functionality to Macs that did ship with OS X install and app restore disks.
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Tim Cook reportedly sent out the following email to all Apple employees today, a day after 







