If your MacBook Air 2017 won't turn on after a restart and you're unable to reset it, there are several potential causes for this issue. Some common causes include a software issue, a hardware issue with the battery, or a hardware issue with the logic board. To troubleshoot this issue, try these steps:
Connect your MacBook Air to a power source and allow it to charge for a while.
Hold down the Command + Option + P + R keys while pressing the power button to start the MacBook Air.