MacBook Air 2012 won’t turn on at all

Hikinghayfever Said:

"MacBook Air 2012 won’t turn on at all: The charging cord shows green when I plug it in and then switches to red"

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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(Applies to Intel-based Macs only), 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 Power:

• If your Mac doesn't Turn On - Apple Support

• 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

What is the Battery Condition? If it says "Service Battery" or "Service Recommended", then the battery needs to be replaced....assuming you are using an Apple OEM Battery (I don't know how third party batteries would register).

You can try running the Apple Diagnostics to see if any hardware issues are detected (some third party batteries may not be compatible with the diagnostics).

If you are using a third party battery, then it may be bad.

All things being equal, the battery is usually the weakest link as long as there has not been any accidental liquid damage or any significant impacts that could have partially dislodged the I/O Cable.

Unfortunately Apple no longer supports battery replacement on the 2012 model, so your only option would be to get a third party battery from OWC or iFixIt. These are the only two vendors I would trust since the quality of third party Lithium batteries is extremely poor. OWC does have authorized resellers for some items in other regions...I'm not sure about iFixIt.