I assume "charger" means "power adapter," in which case your first step might be to try to find another Mac that uses the same one and see if yours works with it. (Don't guess about a machine's specs; be certain before you plug it in!!!)
If you can't find such a Mac try a "Genius" or other Apple tech who, I'll guess, has ways to test an adapter to see if it's outputting the correct power.
Good luck.
