Double check your outlet and power cord make sure both are working. If they are the likely hood is the power supply is gone. As for testing not very easy as you’ll need to fully remove it and probe the unit checking the voltages while its live which can be dangerous!
Here’s the IFIXIT guide: [guide|11722] And here’s the needed part: [product|IF171-017]
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=== Update (07/01/2018) ===
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@thesniper - With so little info its hard to gage ones skills and you didn’t offer what you had checked so I have to start off with the basics. As a reference here is the info from the service guide:
Double check your outlet and power cord make sure both are working. If they are the likely hood is the power supply is gone. As for testing not very easy as you’ll need to fully remove it and probe the unit checking the voltages while its live which can be dangerous!
Here’s the IFIXIT guide: [guide|11722] And here’s the needed part: [product|IF171-017]