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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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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Apple iMac Hardware Test: 4SNS : VH1R

I have some weird fan issues with my iMac. It sometimes goes to maximum speed but only for a couple of seconds and then goes back to normal. Without doing any heavy processing. The hardware test tells ...
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757 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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481 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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I have an apple macbook pro i7 17" mid 2010 model 6,1. I need to do a hardware diagnostic on it, but don't have the DVD anymore, how can I do it?

I need to to do a diagnostic test on my hardware, but don't have the diagnostic DVD anymore. can I download it from some database? it is a macbook pro 17" i7 2.66 Ghz model 6,1 mid 2010
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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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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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637 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 ...