I have a 2011 13 inch i5 MacBook Pro purchased at the very end of February. About one month after using it (I treated it very well, taking special care of it to prevent any damage) the power supply would randomly start and stop working. Generally, wiggling the cable would resolve the issue. About one week ago, I decided to bring in the power supply to an Apple Store. A few minutes later, I walked out with a new power supply covered by my warranty. The person who helped me there said it could be either the power supply or the actual port on my computer. He also said to bring in the computer and power supply if it happened again. Today, my computer was charging and I removed the power supply from the outlet and my computer to move to another outlet. When I plugged it in there, it would no longer charge. Two to three hours later, it still hasn't charged at all. Now I have a feeling that it is the port on the computer that isn't working. I'm going to bring it into the Apple Store in about 2 days (because I can't get there earlier) with the power supply and receipt. Assuming that it is the charging port which is not functioning rather than it being the power supply, will they take my computer in to repair it, give me a refurbished computer to replace it, or do something else? Also, will they format my hard drive?