So you have a laptop that is about 2 years old and suddenly it will not boot.
Batteries in laptops are designed for a maximum number of charges and if you were to charge your laptop every day for 2 years , the battery can die.
So to eliminate the battery as an excuse for the laptop not booting ,pull the battery out , plug the power cord in and try and turn on the computer.
If the computer turns on then get yourself a new battery if not then it is probably not the battery and it is time to look elsewhere for a problem.
Is it just not booting or no power at all?because I had and issue with my dell latitude with no power unless i plug in the adapter.