In addition to the other insightful comments, tech support often recommends turning it off and back on for a much simpler reason: the device in question could have been powered off in the first place. But if they ask it directly, “is it powered on?”, in all likelihood they are going to get a snarky “of course it is, who do you think I am”. Instead they ask for some placebo procedure like blowing on the power cable, and in a not insignificant portion of the cases the caller is going to realize who they actually are but will say “OK, that helped, thanks” without losing face.