macbook air won't turn on

According to Apple:

If your Mac doesn't seem to turn on after you press the power button, follow these steps:

1. Make sure that your Mac is connected to AC power. If it doesn't have a built-in display, make sure that your external display is connected to power, connected to your Mac, and turned on.
2. Press and hold the power button on your Mac for at least 10 seconds, then release.
3. Every Mac has a power button. On notebook computers that have Touch ID, press and hold Touch ID.
4. If you see no change on your Mac, press and release the power button normally.
5. If your Mac now turns on but stops at some other screen during startup, follow the steps for when your Mac doesn't start up all the way.

If your Mac still doesn't turn on, get live expert assistance by contacting Customer Support by phone or chat:

• Call 1-800-APLCARE. 📞
• International Support. 🌐
• Contact Apple Support. 📝
• Live chat using Messages. 💬

hshimshak Said:

"macbook air won't turn on: screen is black have charger in - nothing"

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Troubleshoot the Mac's Power:

As for replacing that battery, that may not be necessary. So, try troubleshooting it.

A. Black Mac Screen:

Go Here: If your Mac doesn't Turn On or Start Up - Apple Support

Using External Devices: Try Resetting the SMC and NVRAM, but this time, using an external keyboard. Connect an external monitor and see if you get an output. This applies to Intel-Based Macs only.

B. Mac Power Issues:

Try a New Charger:

If it is currently charging from a charger, then use a new charger:

• Power & Cables - Mac Accessories - Apple - Select "Mac Compatibility" on the left
• Find the right power adapter and cable for your Mac notebook - Apple Support

C. A Few Links to Refer to Power:

• How to Turn your Mac On or Off - Apple Support

• About Mac Notebook Batteries - Apple Support

• Charge the MacBook Pro Battery - Apple Support

• If your Mac Battery won't Charge - Apple Support

There are various reasons that makes the mac system unbootable and you find your mac won’t turn on. However, the issue can be resolved using below DIY methods:

1. Ensure your mac has a power

2. Check the hardware

3. Perform a power cycle

4. Reset the SMC

5. Reset PRAM/NVRAM

6. Boot in Safe Mode

7. Restore from Recovery Mode

8. Reinstall macOS

Hope this will help!