I have an HP Photosmart C5180 scanner/printer thingy. It works fairly well, except when the drivers are being stupid under Windows. But it has one flaw so appalling that the first time it happened, I almost trashed the printer in a blind rage (yeah, I have some anger issues).
The power supply brick has a three-prong connector; pretty much the same as the “kettle lead” you get on PCs. But this thing, whether through vibration, heating and cooling, or just plain evil, slowly works itself loose. So you go to turn the printer on one day, and … nothing. You check the cables; all are plugged in. Check the wall socket; it’s (zap! ow!) live. After tearing some hair out, you troubleshoot every cable – all looks well until you notice that the plug is just a little farther out of the power supply than it might go. Snug it in a couple of millimetres, and a working printer is you.
This happens every few months. Even when I know it’s likely to happen, it still jars me. Wouldn’t have happened in Bill & Dave’s day.