A hardware test used by holding D during boot, to test internal components of a Mac. It was replaced by Apple Diagnostics in Macs released after June 2013.

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Can't run Apple Hardware Test as Mac crashes

My Macbook: Apple MacBook "Core 2 Duo" 2.0 13" (White/07). Main problem: Mac goes black screen and shuts down when I try and load the Apple HW Test by holding down D as the computer turns on. It goes ...
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415 views

How to test memory after memory upgrade?

I recently upgraded my macbook from 4G to 8G and wonder if there's a tool to test the quality of new memory. I found memtest 4.22 seems only test about 1G: $ memtest all 2 Memtest version 4.22 ...
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488 views

precaution or steps to take before booting up 4 months unused macbook air

My mother was ill for quite some-time, and she didn't use her MacBook Air for almost 4 months now. Before booting it up again, and start making use, please let me know if there are some necessary ...
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403 views

Memory test that fails with a different address each time

I had problems (strange patterns on the display and reboots) with my Late 2011 Macbook Pro, so I ran Apple Hardware Test on my computer, and it found memory errors. The thing is that every time I run ...
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1k views

How to run Apple Hardware Test with broken keyboard?

mid-2011 13" MBA running Yosemite Coffee spill has left keyboard of mid-2011 13" MBA non-functioning. Even power button doesn't work, I boot by shorting the two solder points on logic board. I've ...
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19 views

2009 Mac Mini Wakes Up Immediately After Sleep. What Could be Wrong?

This computer would sleep fine before. Now it wakes up immediately after sleeping, either from a timer, or from the Sleep menu item. Even if all USB ports (except the wireless mouse) are empty Even ...
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293 views

Mac Pro 1,1 running Mac OS 10.6.8

Am having finder freezing problems on Mac Pro 1,1 running 10.6.8. I want to run Apple Hardware Test software but I don't have the disk. I downloaded the program from Github and copied it to DVD, but ...
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88 views

How to check if SMC is functioning OK?

Is there a way to check if the System Management Controller (SMC) is working with no issues on MacBook Pro 13' Early 2011? Can I run selective Apple Hardware Tests to check only specific hardware ...