How to Connect the AC Adapter for a MacBook Pro

Align the smaller end of the MacBook Pro's MagSafe AC adapter with the plug on the upper left corner of the laptop. The connector has a set of five copper pins that match up with five holes in the plug.
Let go of the connector so that it 'drops' into place. Unlike other AC adapters, the MagSafe adapter has a magnetic edge that forms a connection with the AC port on the MacBook Pro. You don't need to push the MagSafe adapter in. As long as you line it up with the plug it should attach to the computer by itself.Apple designed the MagSafe adapter this way to protect your laptop in the event someone trips over the cord. If you pull on the power cord too much it will disconnect from your MacBook Pro. Other AC adapters can pull on laptops and drag them to the floor.
Plug the power brick on the other end of the AC adapter into an electrical outlet. Pull out the two white prongs on the back end of the power brick and wrap any excess cable around them if you so desire.
Install the extension cable that came with your MacBook Pro if the cable is too short. Unplug the MagSafe adapter from the wall. Grip the two-pronged metal plug on the front of the power brick and pull upward to remove it. The MagSafe adapter has a removable plug so that you can install a variety of adapters. Replace the plug with the three-pronged extension cable. Simply insert it where the two-pronged plug was and push down. Plug the three-pronged end of the extension cable into the wall.
Grip the MagSafe connector and wobble it left, right, up or down to unplug it from your MacBook Pro. Do not pull on the cable or pull the connector straight out as this places more wear and tear on the device.
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How to Determine MacBook Build Date

Open the 'Apple' menu and select “About This Mac.” Click on the “More Info…” button.
Locate the serial number for your Macbook in the 'Hardware Overview' window that opens. The serial will be 11 characters long and contain a mix of letters and numerals.
Use the serial number to determine the build date. The first two characters are a code that indicates the factory where the computer was made. The third character is the build date year. It is only a single digit. The number five, for example, would indicate a build date year of 2005 unless the computer is obviously very old, in which case it would indicate 1995. The fourth and fifth characters in the serial number indicate the build date week of the computer. The number 49 would indicate that the computer was manufactured in the second week of December.
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