If you need help using your magsafe adapter see apple portables.
Mac magsafe power adapter not charging.
Inspect every inch of the cable.
Maybe the adapter is not getting its power could be a loose socket or an improper connection.
A simple way to see if it s the problem is by doing a thorough inspection of the entire cable.
But it should power and charge your mac like the adapter that originally came with your computer.
Your power adapter won t charge the computer.
Let it sit unplugged from anything for about 5 minutes.
A replacement adapter might not be the same size color shape or wattage as the original adapter that came with your computer.
The led on the adapter connector doesn t light up when attached to the computer.
The adapter s white insulation separates from the magnetic end of the magsafe connector.
Then reconnect the charging plug to the wall outlet then reconnect magsafe to the macbook pro.
Whatever the cause may be in most cases it s actually the adapter and not the magsafe connector.
It could be frayed broken or burned.
Disconnect the magsafe adapter from the mac and from the power outlet.
If the 2012 macbook pro is the model without the retina display with the cd dvd drive then the 60w would work on both.
The adapter only charges the computer intermittently.