Apple hardware test sometimes takes a little time, so be patient. it can take a while, so sit back or take a break. the lengthy test is a great method to locate issues with ram or graphics.. I ran the apple hardware test (disk came with my imac) on my mid 2010 imac and the test could not find anything wrong, yet i am having what i think is a graphics card problem. imac boots into the grey screen of death and stays there.. And "apple hardware test is included on the dvds that are shipped with some macintosh computers. if the copy on your hard drive becomes unavailable, use the dvds to run apple hardware test. if the copy on your hard drive becomes unavailable, use the dvds to run apple hardware test..
Apple diagnostics and apple hardware test mode can help determine which hardware component may be causing the issue on your computer, and provide first steps to try and resolve it. on mac computers introduced before june 2013, you will use apple hardware test, an older version of apple diagnostics mode.. If your mac didn't come with dvds, apple hardware test is available in the internet, so hold option (alt) and d keys while your macbook pro is starting to download apple hardware test from apple more less. 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..
