My MacBook Air is 8 years old and is refusing to start up.

brandiandscooter Said:

"My MacBook Air is 8 years old and is refusing to start up.: Does the battery need to be replaced or do I need to buy a new MacBook?"

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Troubleshooting Mac Power:

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.

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 for 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 

Your device is considered Obsolete at this point. You may need to consider getting a new one. Have you tried holding in the power button for 10 seconds?

Also try this article for more steps:

If your Mac doesn't turn on - Apple Support

Also... at 8 years you may very well need a new battery. You may want to reach out to an Apple Authorized Service provider to have them check it.

Good Luck!!!