1. Your power adapter won't charge the computer.
2. The LED on the adapter connector doesn't light up when attached to the computer.
3. The adapter only charges the computer intermittently.
4. The adapter's white insulation separates from the magnetic end of the MagSafe connector (also known as strain relief).

If you see a spark

Sometimes when you plug the power adapter into the wall, you may see a spark. This is usually normal and can occur when you plug any electrical appliance into a live outlet. If the spark comes from somewhere other than the blades of the plug, if you experience any damage or discoloration of the adapter, or if you have other concerns about sparking, contact Apple.

Troubleshooting power adapter issues

Make sure a known good outlet is being used.
Verify that the power outlet you're using is working correctly. Plug in a known good appliance, such as a lamp, TV, or clock, and confirm it powers on properly.

1. Make sure a known good outlet is being used. - Verify that the power outlet you're using is working correctly. Plug in a known good appliance, such as a lamp, TV, or clock, and confirm it powers on properl

2. Make sure the proper wattage adapter for your portable computer is used. - Select the appropriate power adapter for your Apple portable computer. You can use a higher wattage power adapter, but you cannot use one with less wattage without potential operating issues.

3. Identify line noise issues. - Unplug the power adapter from the wall, let it sit for 60 seconds, then plug the adapter back in

4. Be sure you are using the adapter in a well ventilated area. - The power adapter may become very warm during normal use. Always put the power adapter directly into a power outlet or place it on the floor in a well-ventilated location. If you are using your MagSafe adapter in a poorly ventilated area, or if the MagSafe adapter is covered by a blanket or other form of insulation, it may turn itself off in order to prevent damage to the adapter.

5. Check for possible AC plug (also known as a "duck head") or two- or three-pronged AC cord issues. - If you're using the AC plug (also known as a "duck head") with the power adapter, swap it out for the included two- or three-pronged AC cord, or if you are using the two- or three-pronged AC cord swap it out with the AC plug. Either connector can be easily connected the adapter as shown below.

6. Check for strain relief issues. -

7. Check for stuck pins or dirty connectors on MagSafe Connectors. -

8. See if the computer is charging and the LED is lit. -