I have a 2013 MacBook Air 13" (A1466), which all off a sudden wouldn't boot up. The charging LED on the cable was always green.
I then attempted:
- Holding the power button down 10 secs
- SMC Reset
- Using a charger from my Macbook Pro (which I know works)
I then thought I would warm the Macbook Air up slightly (by placing it in front of a blow heater). This resurrected the Macbook Air as it started up after a few minutes.
However the next day, it wouldn't boot up again and this time even heating it up didn't work.
So I then ordered a replacement battery from iFixit, as it was a lot cheaper than taking it to the nearest authorised service centre for diagnostics, thinking the there was a reasonable chance that the battery was playing up (it was 7 years old, and starting to show its age anyway).
After replacing the battery, the Macbook Air still won't start. I opened everything back up, and tried to disconnect all visible cables, removed the I/O board, and put it back again, in case a cable had come loose. There was no visible damage on the I/O board either. All cables seemed to be OK.
One thing I've observed is that the charging cable LED never changes colour - it is always amber. And there is not a hint of warmth whilst connected.
I'm now suspecting that there is something wrong with the I/O board. Is there any way of diagnosing a fault with the I/O board? Any other suggestions to look into?