- This is for 1st generation Power Mac G5s only. It includes Mac OS X 10.2.7, software install, restore, and Apple Hardware Test. 691-4657-A,Power Mac G5. Software Install and Restore. Mac OS v10.2.7 (G5).
- Create a bootable USB flash drive by using Disk Utility's Erase function. Make sure you choose OS X Extended for the format and the GUID Partition Map for the scheme. For the purposes of these steps, also give your USB the name AHT when you're erasing it. Download the AHT for your particular Mac Mini here.
Apple Hardware Test (AHT) Description. Apple computers ship with a pre-installed suite of hardware diagnostic tools, known as Apple Hardware Test (AHT). In principle you can start them by holding the d key while booting. Newer models support holding option d to load AHT over the internet.
After isolating an issue on your Mac to a possible hardware issue, you can use Apple Diagnostics to help determine which hardware component might be causing the issue. Apple Diagnostics also suggests solutions and helps you contact Apple Support for assistance.
![Aht Aht](https://archive.org/download/691-5146-A2ZPowerBook_G4_15-inch_and_17-inch._Mac_OS_X_Install_Disc._Mac_OS_v10./2Z691-5146-A.jpg)
Most Macs that run Mac OS X 10.7 Lion will run AHT, but for Macs that are even older you may need the original install DVD’s that came with your computer. This includes any pre-Intel Mac and most Intel Macs until 2007. Apple Diagnostics (or AHT) is a good start, but the test is pretty basic. Coding For Kids. Whether you are a student interested in the IT careers that you could explore with a coding qualification or just fascinated by the world of tech and coding courses, WhiteHat Jr. Offers a wide range of online coding courses that make coding accessible to kids and young teenagers.
If your Mac was introduced before June 2013, it uses Apple Hardware Test instead.
How to use Apple Diagnostics
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- Disconnect all external devices except keyboard, mouse, display, Ethernet connection (if applicable), and connection to AC power.
- Make sure that your Mac is on a hard, flat, stable surface with good ventilation.
- Shut down your Mac.
- Turn on your Mac, then immediately press and hold the D key on your keyboard. Keep holding until you see a screen asking you to choose your language. When Apple Diagnostics knows your language, it displays a progress bar indicating that it's checking your Mac:
- Checking your Mac takes 2 or 3 minutes. If any issues are found, Apple Diagnostics suggests solutions and provides reference codes. Note the reference codes before continuing.
- Choose from these options:
- To repeat the test, click ”Run the test again” or press Command (⌘)-R.
- For more information, including details about your service and support options, click ”Get started” or press Command-G.
- To restart your Mac, click Restart or press R.
- To shut down, click Shut Down or press S.
If you choose to get more information, your Mac starts up from macOS Recovery and displays a web page asking you to choose your country or region. Click ”Agree to send” to send your serial number and reference codes to Apple. Then follow the onscreen service and support instructions. When you're done, you can choose Restart or Shut Down from the Apple menu.
This step requires an Internet connection. If you're not connected to the Internet, you'll see a page describing how to get connected.
![Download Download](/uploads/1/1/9/0/119025368/219799398.jpg)
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If holding down the D key at startup doesn't start Apple Diagnostics:
- If you're using a firmware password, turn it off. You can turn it on again after using Apple Diagnostics.
- Hold down Option-D at startup to attempt to start Apple Diagnostics over the Internet.
I recently had a problem with the battery in my Macbook Air. I was following the instructions provided by Apple, but when pressing the D key upon startup, I was still being booted into Mac OS X instead of the hardware diagnostics.
The knowledge base had no solution for me but, after some looking around, I found the problem.
Your Mac will not boot into diagnostics if you have a firmware password set. In order to run the Apple Hardware Test, you’ll need to temporarily disable your firmware password. Here’s how you do it.
Are you not sure if this is what’s causing the problem? Luckily, this is easy to check.
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- Shut down your Mac (Apple -> Shut Down…)
- Locate the Option key on your keyboard
- Press the Power button and then immediately press and hold the Option key
You will now either see a screen with two hard disk images (your disk and a recovery disk), or a large lock icon with a password entry. If you see the password entry, this is issue preventing you from loading the Apple Hardware Test.
Since you’ve determined that you have a firmware password, we’ll need to temporarily disable it.
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- Follow the steps above (Shut Down, Hold Option until you see the password entry)
- Enter the firmware password
- Select the recovery disk using the arrow keys and enter
- Click Utilities -> Firmware Password Utility
- Click “Turn off firmware password”
- Enter the previous firmware password
- Shut down your Mac (Apple -> Shut Down…)
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Now you should be good-to-go! Follow the instructions provided by Apple and run the tests. Remember to reset your firmware password when you’re done.