Get Apple {Hardware} Check Boot Mode Again on Some OS Lion Macs

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Mac OS X Lion has modified how a number of helpful troubleshooting utilities work, one is the password reset instrument and the opposite is how Apple {Hardware} Check (AHT) mode works. Gone is AHT’s unbiased boot mode in favor of an Web model that depends on Lion’s Web Restoration as a substitute. If you happen to all the time have entry to the web, this isn’t an issue, however in case you can’t get on-line, it’s not very helpful.

There’s a workaround, no less than for some Macs, and that’s to repeat the previous Apple {Hardware} Check utility to the Mac OS X Lion startup disk so you’ll be able to boot up from AHT by holding down the “D” key as standard. The catch? You want a pre-Lion Mac that got here with the Mac OS X installer and utility installer discs, sure, the DVD, from 10.6 or in any other case. This clearly excludes a number of the newest Macs just like the 2011 MacBook Air and Mac Mini from onboard AHT restore, however it can work to revive performance to Macs that got here with OS X set up discs and app restoration discs.

Listed here are Apple Assist’s particular person compatibility pointers:

Apple {Hardware} Check is included on the DVDs that include some Macintosh computer systems. If the copy in your laborious drive is not out there, use the DVDs to run Apple {Hardware} Check.

• For Intel-based Apple computer systems shipped with Mac OS X v10.5.4 or earlier, Apple {Hardware} Check is on Mac OS X Set up Disc 1 and have to be included together with your laptop.

• For Apple computer systems shipped with Mac OS X v10.5.5 to 10.6.7, Apple {Hardware} Check is on the Purposes Set up Disc 2 and ought to be included together with your laptop.

• For some Apple computer systems shipped with OS X Lion, an Web model will begin if Apple {Hardware} Check can’t be discovered on the laborious drive. up as a substitute.

“Free,” which implies that this isn’t an formally sanctioned methodology of getting it function from Apple, however fairly it’s a approach of figuring out whether or not your Mac can use it. In case your Mac meets the necessities, which implies that Lion will not be preinstalled, right here’s what you have to do:

  • Insert the Mac OS X Set up Disc into the Mac
  • When the drive is mounted, make an observation of the quantity identify and use the next command to repeat the AHT diagnostics instrument to OS X Lion:
  • sudo cp -R /Volumes/DISKNAME/System/Library/CoreServices/.diagnostics / System / Library / CoreServices

  • For instance, if the quantity identify is “Purposes Set up Disc” then the command could be:
  • sudo cp -R / Volumes / Purposes Set up Disk / System / Library / CoreServices / .diagnostics / System / Library / CoreServices

You will want to confirm the copy because it pertains to your system folder, however after that is completed, you’ll be able to restart the Mac from Apple {Hardware} Check – with out Web Restoration – by holding down “D” throughout startup.

Apple {Hardware} Check is a helpful set of diagnostic instruments, and when mixed with issues just like the command-line-based MemTest or the Rember GUI instrument to check for defective RAM modules, these are good methods for figuring out if some Mac issues are software- or {hardware} associated.

Due to Eric for sending the AHT tip from MacWorlds Hints

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