• Verify that the AC adapter brick is receiving power. 
    • Shut down the computer and unplug the adapter from the system first and then from the power socket. Wait 5 seconds.
    • Plug the adapter directly into the wall socket, bypassing surge protectors, UPS units, or extension cords. The adapter LED should produce a steady green light.
    • If you do not get a green light, try the adapter in another wall outlet in another room or verify that the first outlet works with a lamp or hairdryer.
    • You can also isolate the power problem to a bad adapter by swapping it out with a second adapter – such as one for use with the port replicator. 
    1. If the adapter LED lights, check the computer for bad connections. 
    • Examine the system power socket to be sure it does not have any bent, missing, or pushed-in pins.
    • Plug the adapter connector directly into the computer, bypassing surge protectors, extension cords, etc. Be sure that the adapter connector fits tightly into the computer’s power socket. 
    1. If you have access to another computer like yours, try your adapter on it or its adapter on your computer.