Chosen Solution
When I found that my computer wouldn’t start, I removed the charger from the port (DC end) and the computer side of the port was brown, cracked and had what appeared to be magnetic debris lodged inside. There was also a pungent smell around the charger port. After I cleaned the port (no liquids) I plugged the adapter in and hit the power button, only to hear a sizzling noise! I’m wondering a) how something managed to get inside the port while the charger was plugged in, and b) how can I tell if this is just a blown fuse, or a fried computer, short of taking it apart. I’ve tried taking out the battery, using other chargers, resetting the SMC, PRAM, etc. I’ve cleaned it with compressed air and other safe methods. ALSO, the battery is fine, the indicator light flashed 4 bars. This is a late 2007 MacBook that I’ve had since about that time.
There was probably a small metal object stuck in your MagSafe port (because of the magnet) and you shorted the internal pins when connecting the AC adapter. If you’re lucky and there’s no damage to the logic board replacing the MagSafe DC-In Board should restore the power connectivity to the MacBook. MacBook MagSafe DC-In Board
