If pins are okay, reseat power adapter connector and make sure it is fully inserted.
Check for damaged pins or magnetic debris on MagSafe power adapter. If the cord is properly inserted, the LED should light up if not, go to the "MagSafe power adapter" symptom. Connect a known-good Apple 60W MagSafe Power Adapter and power cord to a known-good power outlet. At least one LED must light continuously (not flashing). Check that the battery has enough charge to start the computer by pressing the button next to the LEDs on the battery (on the bottom of the machine). Use the "No display or dim display" symptom to resolve this issue. In this case, the system is working properly except for the backlight. An image may be barely present on the screen, but with no backlight clearly illuminating the image. 
Move on to the "Power, but No Video" troubleshooting section. At this point, the issue is no longer a 'No Power, No Video' problem.
In this case, hold down the power button for six seconds to ensure the system is shut down before working on the computer. If you see the sleep LED come on or the Caps Lock LED illuminate when the key is pressed, then the system is indeed drawing power. Note: After each step, check that the system is not supplying power to the logic board.
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