![]() ![]() It's memory tests usually confirm suspected RAM issues. If you're instead looking for a tool to run from within your OS then my tool of choice has always been TechTool Pro. memory clean snow leopard pro Now to clarify my point about why cheap was both a pro and a con, if you are lucky enough to get a decent condition unit, it is a very good deal for the price however, if you are unlucky like me, you get one that shouldn't have made it out of the QC check and should have either been properly rehabbed, or turned. While similar to AHT in it's capabilities it lacks the option for an extended test. Newer, post June 2013, Macs will instead use Apple Diagnostics. Life would be much easier if upgrading didnt. Newer Macs that shipped with 10.7 or above, or without restore media, will follow the same steps as above however they can ignore the very first step since there is no media to insert in the Mac. Alas, DDR2 memory is now so expensive I cant imagine trying to upgrade to the 6 GB I think my machine could take. For what you're interested in though you'd be looking for a failure beginning with 4/MEM, this would indicate a failure with the memory test, either with the DIMM or the DIMM slot on the logic board. This Cnet article does a great job of explaining the error codes. If the tests fail you will receive a somewhat cryptic error code. If the tests pass you will receive a "No trouble found" message. The extended test takes considerably longer (typically an hour although this will vary based on hard drive size and amount of installed RAM) but is more thorough. You have two options, quick test (the default setting) or a checkbox to run an extended test. The middle tab, Hardware tests, is the one you'll use Hardware Profile shows the Macs configuration. If you see the Apple logo then you will need to shutdown the Mac and try again. It may take several (15+) seconds for AHT to load, once loading though you should see this icon appear on the screen. ![]() Insert the gray restore DVD (or USB recovery disk if MacBook Air) Older Macs that shipped with a gray restore disc/s or MacBook Airs that shipped with a USB recovery disk: The extended test runs full verification tests on the RAM, the basic hardware tests and a full disk scan of the hard drive.Īpple has a knowledge base article devoted to AHT: Using Apple Hardware Test -HT1509īasically depending on the age of your Mac you have two options. It allows for both a quick test (basic memory tests, basic test for other components and a quick HD scan) and an extended test. I've been a fan of Apple's Hardware Test (AHT), built into newer Macs and available on restore DVDs for older Macs, for several years now. ![]()
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