I have a mid 2012 MacBook Air and it is looping on startup sound, stuck on white screen.
I have tried:
- formatting the SSD and installing the latest version of macOS Mojave
- resetting NVRAM and SMC
Neither of the above worked and my MBA is still looping on the startup sound.
However, if I try booting up from the same SSD on another MacBook it boots fine from it.
How may I troubleshoot this further?
Best Answer
Since you've already reset both the NVRAM and SMC and established the SSD is capable of booting another MacBook, I'd try testing your MacBook Air hardware.
Run Apple Hardware Test
Your model of MacBook Air uses Apple Hardware Test. To use this, follow these steps:
Note 1: that the extended test will take some time. Take a note of the results and report back.
Note 2: If pressing and holding the D key at Step 3 doesn't work, start again at Step 1 and, at Step 3 press and hold both the OptionD keys instead. This will try and run diagnostics from the internet instead, so you will need to allow more time for it to complete.
Once complete, let us know your results.