There are multiple causes for a MacBook failing to turn on. These are a few of the most typical reasons:

• Water Damage
• MotherBoard Hardware Short Circuit
• Wear and Tear 
• Device always on Standby Mode
• Device always on Sleep Mode
• Never Shut Down Regularly 
• Frequent Over Night Charging 
• No Maintenance was done over the years 

It can be annoying if your MacBook won't come on, particularly if you use it for work or personal purposes. The following actions can be taken to address and resolve the problem:

1. Check the power connection: Verify that the power supply is correctly connected to your MacBook. Verify that the LED light on any MagSafe adaptor you are using is on. Try unplugging and replugging the adaptor if the light isn't on.
2. Reset the SMC: To resolve the issue of your MacBook not turning on, consider resetting the System Management Controller (SMC). Power management is managed by the SMC, which occasionally becomes stuck and causes problems. Use these procedures to reset the SMC:
   
• Shut down your MacBook.
  
• Connect the power adapter.
• Press and hold the Shift, Control, and Option keys and the power button simultaneously for 10 seconds.
• Release all the keys and the power button.
• Press the power button to turn on your MacBook.
3. Reset the PRAM: Resetting the Parameter RAM is an additional action that can be taken (PRAM). Resetting the PRAM can assist in fixing problems because it stores specific settings. Take these actions to reset the PRAM:
• Shut down your MacBook.
• Press the power button, and immediately press and hold the Command, Option, P, and R keys.
• Keep holding the keys until your MacBook restarts and you hear the startup sound twice.
• Release the keys.
4. Check the display: To determine whether the problem is with the display, try connecting your MacBook to an external display if it seems to be on but the display isn't working. There might be a problem with your MacBook's display if the external display functions.
   
5. Contact Support: There might be a hardware problem if none of the aforementioned fixes resolve the problem. It is preferable in this situation to get in touch with Apple Support or bring your MacBook to the Esmond Service Center.
   

Finally, if your MacBook won't switch on, don't freak out. To solve the problem, try the aforementioned methods. To get your MacBook operating again, get in touch with Apple Support or a reputable repair facility if the problem continues.