which power cord to buy?
I have a MacBook Air, 13", early 2014. I bought an Apple 45W MagSafe 2 Power Adapter and it doesn't work. Which one should I buy?
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The one you bought is the correct one. See the following from Find the right power adapter and cable for your Mac notebook - Apple Support
45W MagSafe power adapter with MagSafe 2 style connector
- MacBook Air models introduced in 2012 through 2017