I meant this evening to continue exploring the installation of Slackware
onto my old Dell laptop. The battery stopped working many years ago and I've been running it off the mains. This evening I plugged in the power-supply and switched on at the socket and nothing happened.
I've put a meter across the mains outlet and it's working and the plug's fuse is okay and power gets as far as the connection into the power supply, but there's no little green light coming on.