I just want to say how disappointed I am with Apple. I have had 3 MacBook Pros that have had the same problem. The prongs is the plug part that attaches to the computer goes bad and will no longer charger. Every time I turned it into warranty they told me the plug-in wasn't covered and I had to buy a $80 charger. They even totally replaced the computer once. They said it was the electrical current in my house. Through searching the internet I found something surprising. A person had posted this in the apple community but apple deleted it. You can find this problem all over the internet with MacBook pros. All you have to do is clean the plug-in and the plug-in port with alcohol and push on each of the prongs until they all pop up. The problem is that the prongs gets stuck down. I have probably bought 5 chargers due to this problem. Please pass this information on as apple doesn't want anyone to know it.