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You can use the Apple Hardware Test (AHT) to diagnose issues you're having with your Mac's hardware. This can include problems with your Mac’s display, graphics card, processor, internal sensor failure, memory, and storage. You can use Apple's Hardware Test to rule out most hardware failures as the culprit when you're trying to troubleshoot problems you're experiencing with your Mac.
From time to time Apple’s hardware can fail, you end up spending hours and hours try so sort problems that don’t exist sometime spending money on the wrong hardware. the most common hardware failure is random-access memory (RAM). The Apple Hardware Test can check your Mac's RAM and let you know of any issues with it. With many Mac models, you can replace faulty RAM yourself, and save a few pounds in the process.
The Apple Service Diagnostic application is designed to run both EFI and Mac OS X tests from an external USB hard drive. Apple Service Diagnostic (EFI) runs low-level tests of the hardware directly and does not require Mac OS X, while Apple Service Diagnostic (OS) uses Mac OS X to run tests.
We do not supply the cheap nasty slow USB Keys, even though you only generally need only 4GB our keys are Fast USB 3.0 & 3.1 Keys of 32GB in size which is what you are paying for, they are much more useful and can simply be formatted and re-used afterwards to backup your important data or whatever else you might need.
Apple Service Diagnostics (KEY1)
Apple Service Diagnostics (KEY2)
Apple Server Diagnostics (KEY3)
Apple Service Diagnostics (KEY4)
Apple Service Diagnostics (KEY5)
Apple Service Diagnostics (KEY6)
Apple Service Diagnostics (KEY7)
Apple Service Diagnostics (KEY8)
Apple Service Diagnostics (KEY9)
Apple Service Diagnostics (KEY10)
Apple Service Diagnostics (KEY11)
Apple Service Diagnostics (KEY12)
Apple Service Diagnostics (KEY13)
Apple Service Diagnostics (KEY14)
Apple Service Diagnostics (KEY15)
Apple Xserve Diagnostics and Apple Server Diagnostics tools (KEY16)
Apple Service Display Utility (KEY17) DVD
Apple Service Diagnostics (KEY18)
Apple Service Diagnostics (KEY19)
MacBook Air (Late 2008)
Apple Service Diagnostics (KEY20)
Apple Service Diagnostics (KEY21)
Apple Service Diagnostic (KEY22) Including DVD
Apple Service Diagnostics (KEY23)
Apple Service Diagnostics (KEY24) Including Dual Boot CD
Booting and using the Apple Service Diagnostic application
Before using Apple Service Diagnostic, disconnect any Ethernet network, USB, and audio cables.
With the USB Key plugged into a USB port, restart the computer and hold down the option key as the computer boots up into the Startup Manager. To run ASD (EFI) select the "ASD ?” drive icon and press return or select it with a mouse click. To run ASD (OS) select the "ASD ?” drive icon and press return or select it with a mouse click. ASD (EFI) will load in 20-30 seconds; ASD (OS) will load in 2-3 minutes. After running ASD (OS) or ASD (EFI), press the Restart button to restart the computer back into the normal startup volume, or hold down the option key to get back to the Startup Manager.
USB Key Product Description
USB Flash drive is compliant with USB 3.0 specifications¹ to take advantage of technology in newer notebooks, desktop PCs and digital devices. With the Flash drive, storing and transferring of documents, presentations, music, video and more is easier than ever. features a sleek, cost-effective design to make adding to the USB 3.0 experience a minimal investment. Available in capacities from 16 GB-256 GB² and is backward compatible with USB 2.0.
1. USB 3.1 Gen 1 performance requires a host device with a USB 3.0 or 3.1 port.
2. Some of the listed capacity on a flash storage device is used for formatting and other functions and thus is not available for data storage. As such, the actual available capacity for data storage is less than what is listed on the products.