An HP laptop which only charged if the power cable was held at a certain angle.

Stripping the laptop down, we get to the power connector, and you can see that the centre lead has become detached (red arrow). The owner was desperate to use it so as a temporary measure I soldered the joint and the owner took the laptop away  (solder isn’t a mechanically strong metal so this isn’t a permanent fix, we need a new connector but fortunately these are only a few pounds)

When the new connector arrived a few days later, the owner bought the laptop back and I fitted the new connector. £20 charged in total