Diagnostics For Mac

The users trust Mac machines for its performance, reliability, speed, and quality. But when they start to underperform or give issues, we get annoyed. To resolve the problem, we either update the operating system, apps, and other installed programs or take it to the nearest store, right?

Does anyone know any good diagnostic tools for Mac? Something inline with Apple Hardware Test, Apple Service Diagnostics, tech tool pro, preferably more in depth perhaps something low level, pre-OS-startup. I need to do a complete hardware test on some MacBooks and one iMac, that is to do a thorough test of all components GPU, CPU, HDD, ODD, logic board, memory. Apple hardware test would. This article describes some useful tools for Microsoft Outlook for Mac. More information Outlook Search Repair. The Outlook Search Repair tool repairs search results within Outlook. Due to some changes in macOS Mojave, this tool no longer works in 10.14 and higher. If you are on macOS Mojave (10.14), you can follow the steps below to.

We do this out of habit because in general, most errors are tracked to unstable software. But do you know faulty hardware can also cause these issues?

To know if it is the faulty hardware, let’s run Apple Hardware Test, also known as Apple Diagnostics.

What is Apple Diagnostics?

Built-in Mac since 2013 Apple Diagnostics or Apple Hardware Test are the tools designed to diagnose problems with your computer’s internal hardware. These tests are an effective way to identify the cause of a Mac performance problem. This could be a failing disk drive, CPU, GPU, or overloaded memory.

How to Run Apple Diagnostics on Mac?

Sometimes due to hardware problems, the Mac system fails to boot. Luckily, we have Apple Diagnostics or Hardware Test, to resolve this problem. Using them, we can restart Mac.

Note: Before running Apple diagnostics, Apple recommends printing the support instructions. Once you’ve them, you can follow the steps below to run Apple diagnostics (on newer hardware & OS) and Apple Hardware Test (on older devices)

Steps to Run Apple Diagnostics on Mac

Note: Before running Apple Diagnostic disconnect all peripherals, external drives, and hardware devices excluding monitor, keyboard, and mouse.

1. Click the Apple logo and select Restart.

2. Press and hold D key until you see list of different languages on the screen

3. Choose the language; this will run Apple Diagnostics automatically.

4. Wait for 2-5 minutes to get the list of detected problems.

5. You’ll see solutions and error codes.

6. Once you have all the information, you can either repeat the test to get more details or can restart the Mac.


What if you are unable to run diagnostics?

If Apple Diagnostics fails to run on your Mac, don’t panic. This is not an unsolvable problem. There’s a possibility that some external device is still attached. So, double-check everything and disconnect CD, USB leaving display, keyboard, mouse intact.

Besides, this part of the diagnostics can be damaged. To resolve this restart Mac by holding down Option + D. If this too doesn’t work, then firmware password can be a problem. Make sure you disable it.

Once you keep these points in mind, you will be able to run Apple diagnostics.

What if Apple Diagnostics founds no issues?

Say, for example, you run the diagnostics, and it comes back with nothing? Does it mean everything is fine? Or things are in such bad shape that you will need to buy a new Mac?

Don’t worry; it’s nothing like that. If Apple diagnostics show nothing, it means the hardware is in perfect condition, and the problem might be with the software. Therefore, you need to check if your Mac is overheating or slowing down too much. If that is the case your Mac might be running low on disk space, there might be a lot of junk files or too many duplicates.

All this not only takes up storage space but also slows down Mac, making it difficult for you to work.

In such a case using a best Mac optimizer and cleaner that can clear junk files, declutter Mac, organize data and boost performance is needed. With over 3+ million downloads and several positive reviews, TuneUpMyMac is the right tool for this task. Using this efficient and robust Mac Cleaner, you can quickly recover gigabytes of storage space occupied by unwanted data.

Here’s how TuneUpMyMac works:

1. Download and install TuneUpMyMac

2. Click Start System Scan from the home page

3. Wait for the scan to finish. Acrobat adobe 9 for mac. You will now be able to see detected errors on your system.

4. Click the name of each area to see details about the detected errors

5. When satisfied with the result, click Clean Now.

6. However, if you want to scan and clean each section individually, you can select the modules from the left pane.

7. Once you have the scan results, click Clean Now to fix all the detected errors. By clicking Duplicate Finder, you can scan Mac for all types of duplicates and click them in a single click.

Yay! All the detected errors are removed, and now your Mac will perform better. This means you will see a speed and performance boost.

With just a click or two, you can declutter your Mac and boost system performance. After running the Apple Hardware Test, you know there’s nothing wrong with the hardware. So, to fix software related issues, try using TuneUpMyMac and fix heating, space, and other issues that you often face on Mac.

We hope this article was helpful, and you were able to find answers to all your questions. Stay tuned for more such information.

Mac can be conveniently purchased from the Apple store and most of configuration allows you to upgrade the memory so that you don’t need to open the case and take the risk in using an incompatible memory which would cause system lockups.

The only thing is the upgrade from Apple store cost a lot more money if compared to the one that it purchased from a computer store. For example, an additional 2GB of memory cost $50 at Apple Store while it only cost less than $10 if you search in Pricewatch. If you’re willing to take the risk in adding extra memory in your Mac either to save money or perhaps you have a few lying around, it is best to run a memory test to make sure that the RAM is fully compatible and won’t make your Mac unstable.

Here we suggest 3 different methods to easily run a memory test on your Mac OS X including the latest Mountain Lion 10.8.

1. Rember

Rember is actually a GUI for the popular command line memory testing tool called Memtest OS X. Instead of typing commands in terminal, you can run the test by clicking a button. You are able to test a selected amount or all of the memory, specify the number of times the tests should run and also viewing of the log. Rember includes Memtest OS X in the package so there is no need to manually download and install the memtest. Running Rember will show a table displaying the detected memory on your Mac. Select the amount of memory to test, number of loops and click the Test button to start checking the memory. When the tests is finished, Rember will show the test results.

Rember runs in Mac OS X which means that not all of the ram can be tested due to a portion of RAM being reserved for housekeeping.

Download Rember

2. Memtest86+

If your Mac has a SuperDrive, you can burn the pre-compiled bootable ISO image of the Memtest86+ and boot up the Mac with the disc. Just press and hold the C key when starting up Mac to boot from the disc.

The good thing about Memtest86+ is it runs by itself without relying on the operating system, giving you a more accurate memory test result.

Download Memtest86+

3. Apple Hardware Test

This is the recommended way by Apple to test your memory using their diagnostic tool. If you have an installation disc, insert the disc, restart your Mac, press and hold the C key. Select the language for the Apple Hardware Test and click the Test button to start testing. You can also tick the “Perform extended testing” option which would perform a more thorough test that takes considerably more time to complete. On the latest Mac OS X Mountain Lion, the Apple Hardware Test is already pre-installed and it doesn’t come with an installation disc. Simply boot up, press and hold the D key to start the Apple Hardware Test.

You can also see the amount of memory installed on your Mac at the Hardware Profile tab to confirm that the memory is correctly installed and detected. There are some Apple Hardware Test images that can be downloaded for older models. Do note that the Apple Hardware Test images are machine specific meaning that you cannot use the iBook version on a Mac Mini.

Download Apple Hardware Test

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Night3 months ago

‘Closing all apps’ is an option which can be set or disabled in the Rember preferences.


I’m trying to test DRAM one bank at a time in mid-2010 Mac mini with 2 banks of 4GB Kingston DRAM each.

Rember run overnight on max cycles (255) showed when both banks were full (8GB total), there was a DRAM failure. But run overnight on max cycles (255), Rember is so slow it’s completed less than 30 cycles. I tried this twice.

Is it not possible to check one 4GB stick at a time? (Mid-2010 Mac mini standard RAM is 1GB module in each bank for total 2GB.)


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Charlzm10 months ago

I have several DDR3 DIMMs I want to install, but the memory timing is not printed on them. Is there an app for Macs that can tell you what the timing is on installed DIMMs?


Rember doesn’t shut down existing programs… you do that yerself

Rakiki1 year ago

Rember is an amazing app! In regards to the comment above:

it closes all windows because to free-up whole RAM memory for tests.
It’s understandable that you must save your work before you open any diagnostic app.

Works great on latest 2019 iMac where Memtest failed and Apple Diagnostic Tool is a JOKE



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I ran this app and it closed all open windows and running apps without asking or warning me. That is bad software. Who knows what data I lost as a result, let alone time in reopening what I can remember was running. memtest does not do this.

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Ron Helgerson5 years ago

Hope this works well, thanks!


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