Low-tech but high-consequence. I have a laptop with the power-cable connection causing the power to be disconnected if it gets moved a bit. I've tried with other cables and get the same behavior, so it's the connection on the computer, not the power supply or its cord.
Any ideas on how to solve this? Will putting aluminum foil in there be safe, or might it short and burn the computer?
Which one of the parts is the grounding? There's the cylindrical-part's outer metallic part, its inside, and a thin wire in the center of it. Which one does what?
Here's a link to something like it.