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I have a 1.25Gb iMac 20' G4 that originally shipped with OSX 10.3 back in 2004. I must have inadvertently discarded the install disc which contained the Apple Hardware Test. I am trying to locate a copy of the AHT that I can burn onto a CD. Oddly, when I attempt to download the AHT from Apple's website, all that I get is the Read Me file. Download MacBook Mac OS X 10.4.9 Install AHT v3A128 Disc v1.0 2007 (DVD DL) for Mac. Mac OS X Install Disc 1. Mac OS v10.4.9. 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.

1. Apple used to have an official site (info.apple.com/support/aht.html) for downloadable AHT dmgs, but this site is long gone, images are now preserved here. Apple Hardware Test (AHT) is a diagnostic CD that is distributed to customers who purchase a new Apple computer.
2. Unused Diary Entries. Hat Kid's diary can be found in her bedroom by using the Ice Hat on the pile of pillows. Since both the Ice Hat and the first few Time Pieces are required to access this area, these diary entries are rendered inaccessible.

Apple Hardware Test for PowerMac G4 had at least these versions (made 2000-2004):

1.0 , 1.1 , 1.2 , 1.2.1 , 1.2.2 , 1.2.3 , 1.2.4 , 1.2.5 , 1.2.6 , 1.2.7 , 2.0 , 2.0.1 , 2.0.2

[AHT for PowerMac G4 Cube is different than this page, is stored here:]
http://macintoshgarden.org/apps/apple-hardware-test-powermac-g4-cube

Individual AHT versions in oem condition are the downloads #3 and up. DL #1&2 not official Apple products, 1&2 are the same All-In-One compilation v0.7 created in the open here by a community member (dL2 is for manipulating the image in OS 9, dL1 is same thing for OS X).

All-In-One v0.7-PMG4 houses many AHT versions 2.2.5 , 2.1.0 , 2.0.2 , 2.0.1 , 2.0.0 , 1.2.7 , 1.2.6 ~ plus ASD(OF) version 2.6.3 for its Extended Test of Video begins a lot sooner than AHT, if this one test were your goal.

All-In-One contains many bug fixes to its AHTs, commented in source and in documentation. AIO loads faster than oem, doesn't require disc(s) and can be installed on hard drives, SSDs, and on USB. After booting to AIO there is a menu in which the selected version is displayed, click the mouse to scroll through the available versions, and hold the mouse button down for a half second to begin loading the selected version. All versions tested to perform on Mirror Door 2003 model, even on when the motherboard of G4 is reprogrammed to a G5. Notice the AHT versions 2.2.5 and 2.1.0 go best but were amazingly distributed by Apple for only the G5.

Consider using AHT without discs. Apple's original method of booting AHT had been one version per disc you had to burn, and then Apple's original versions could encounter trouble running unless patched in ways found here. Explore this All-In-One solution.

dL #3 &up are library archives of original unmodified images or original download files. If you grab these you will find all images are empty of files and potentially useless to you because files had been hidden by apple and these images are limited in ways that the AIO isn't.

Screenshot 1 is the AHT Scripting Icon.

Screenshot 2 is the AHT v2.1 Title Screen (run on a G4 in this picture).

Screenshot 3 is the AHT v2.2.5 Tests Screen, after a 'Mirror Door late 2003' with over 2GB RAM completed and passed the 'Quick Test' in 5min:16sec.

Screenshot 4 is the AIO menu screen, shown here on an 800 X 600 resolution. Background color is deliberately black and other colors dilute to discourage CRT 'burn-in' if this gets left on. The text written stays legible if resized to any screen resolution.

Screenshot 5 is AIO AHT v1.2.6 describing 3GB (more than 2GB) RAM in Mirror Door late 2003 hardware. MDD-2003 should not be using AHT version this low, this is done for learning. All versions AHT 1.2.6 &up describe RAM > 2GB this same way. The red color is warning that Mac OS does not directly use what's in slot 3 nor > 2GB, however this model mdd2003 can utilize RAM > 2GB for video acceleration by feeding that RAM on a backchannel to the AGP bus [ link ].

Screenshot 6 is AIO AHT v1.2.6 complaining about a particular ram module, a module which works well and I use. It looks more serious than it is, actually it is not a serious thing, other than this module used to stop AHT 1.2.6 (thru 2.0.1) from launching but our 'All-In-One' fixes said bugcrash revealing this screenshot instead. There is only one 'ERROR' even though the word error is shown three times because each Line of text-output is deciding separately that it won't print its info. The DIMM speed in this case reports 'unknown' but on that same line: 'SPD' is NOT an abbreviation for SPEED rather it is the abbreviation for 'Serial Presence Detect' and pronounced SPuD. It is important to note that AHT is NOT declaring the DIMM is Unsupported, what it says is the 'SPD' associated with this DIMM is unsupported, important distinction. This DIMM works perfectly and its SPuD is of no concern to Mac OS, but a concern that ONLY AHT cares about ! The SPuD is some small data that's held inside the tiny (less than 5mm X 5mm square) chip located in one corner of the memory module.

Screenshot 7 is AIO AHT v2.2.5 a RAM detail. This screen is the same as in AHT v2.1 where it has this new way of describing the 'CL' profile per ram module, text unfamiliar to G4 users, until now. Older AHT versions give a different 'CL' description.

Screenshot 8 is one of the many views in the AHT or ASD tests of VIDEO-RAM.

Screenshot 9 is AIO AHT v2.2.5 Hardware Profile of one hot Power Mac Mirror Door late 2003, with personal info redacted. All redacted text and all visible text is being reported accurately, with one exception there is no real confirmation the RAM in ramslot #3 is healthy and in use, which it is. I believe this is the same RAM profile if the DIMM in slot 3 were recognized but was so bad/damaged that zero MB can be utilized of it. Anyway, notice the total RAM capacity in red upper right corner, expressed with '3GB' not 3072MB as in earlier versions. Notice I am a 'Power Mac G5' having a G4 CPU, this is accurate. My L3 cache size and speed is accurate, 1.583 GHz /6 (aka 6 : 1) = 263.888 MHz L3 bus. My video card and vram capacity are both accurate, AHT v2.0.2 &older could not get these right.

All changes made to AHTs within the AIO group are in verifiable open source scripted formats, documented and surgically targeted bug fixes that amount to as little as 4 to 6 lines of script per AHT version, less than .0001 percent of total code. AHT in its entirety is not open source, it contains precompiled libraries and debuggers that remain unaltered in All-In-One.

This OVERVIEW link has All the AHT and other Test software here:
http://macintoshgarden.org/apps/apple-hardware-test-cds

640 X 480 or greater display resolution; mouse.
AHT is a Firmware program, it does NOT run on any Mac OS.

If you think your Mac might have a hardware issue, you can use Apple Diagnostics to help determine which hardware component might be at fault. Apple Diagnostics also suggests solutions and helps you contact Apple Support for assistance.

Prepare your Mac

1. Shut down your Mac.
2. Disconnect all external devices except keyboard, mouse, display, Ethernet connection (if applicable), and connection to AC power.
3. Make sure that your Mac is on a hard, flat, stable surface with good ventilation.

Start Apple Diagnostics

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

1. Turn on your Mac and continue to press and hold the power button as your Mac starts up.
2. Release when you see the startup options window, which includes a gear icon labeled Options.
3. Press Command (⌘)-D on your keyboard.
   

Intel processor

1. Turn on your Mac, then immediately press and hold the D key on your keyboard as your Mac starts up.
2. Release when you see a progress bar or you're asked to choose a language.
   

View the test results

Apple Diagnostics shows a progress bar while it's checking your Mac:

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When testing is complete, Apple Diagnostics shows the results, including one or more reference codes. Learn about Apple Diagnostics reference codes.

To repeat the test, click “Run the test again” or press Command-R.

To restart your Mac, click Restart or press R.

To shut down, click Shut Down or press S.

To get information about your service and support options, make sure that your Mac is connected to the internet, then click ”Get started” or press Command-G. Your Mac will restart to a webpage with more information. When you're done, choose Restart or Shut Down from the Apple menu.

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Learn more

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On an Intel-based Mac, if you can't start Apple Diagnostics with the D key, try these solutions:

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• Press and hold Option-D at startup to use Apple Diagnostics over the internet.
• Make sure that your Mac isn't using a firmware password.