Click Utilities -> Firmware Password Utility.Select the recovery disk using the arrow keys and enter.Follow the steps above (Shut Down, Hold Option until you see the password entry).Since you’ve determined that you have a firmware password, we’ll need to temporarily disable it. If you see the password entry, this is issue preventing you from loading the Apple Hardware Test. 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. Press the Power button and then immediately press and hold the Option key.Shut down your Mac (Apple -> Shut Down…).Checking to see if you have a firmware passwordĪre you not sure if this is what’s causing the problem? Luckily, this is easy to check. In order to run the Apple Hardware Test, you’ll need to temporarily disable your firmware password. Your Mac will not boot into diagnostics if you have a firmware password set. The knowledge base had no solution for me but, after some looking around, I found the problem. 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. I recently had a problem with the battery in my Macbook Air. Mac Not Booting to Apple Hardware Test (AHT)? Try this.
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