Thanks for asking the Apple Support Communities for help with your Mac. You mentioned only the SMC reset. I recommend checking everything provided in this help article: If your Mac won't turn on - Apple Support
It also links to this help article to help you check your MagSafe adapter: Apple Portables: Troubleshooting MagSafe adapters - Apple Support
If you still have issues after trying everything in both those articles, the first article states:
If your Mac still won't start up after you've tried each of these steps, visit an Apple Store or Apple Authorized Service Provider for further diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar, if available in your country or region. Diagnostic fees may apply for issues not covered under warranty or AppleCare Protection Plan (APP).
Thanks and have a wonderful day.