How do you I switch on my macbook??
My macbook is suddenly not switching on. I tried everything. What to do!
Macbook air 2014
MacBook Air 13″, macOS 10.14
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If you tried everything, then have Apple or an Apple Authorized Service Provider (AASP) examine the laptop to provide you with a repair estimate. FYI, this laptop is considered "Vintage" so parts may no longer be available to repair it depending on the problem. An AASP may be your best option if you want it repaired versus just a diagnosis since I don't believe Apple will repair a "Vintage" laptop.
If you had provided a list of things you had tried, then we could try to fill in with other options for you to try. But you tried everything, so there is no point for providing more specific suggestions beyond the basic options in these two Apple articles:
If your Mac doesn't start up all the way - Apple Support
If your MagSafe cable or power adapter isn't working - Apple Support