Most of the time, it's not PSU. It's the way people do things.
That's why they say if it's not the PSU problem, they are going to
charge you, for making their blood pressure go up.
I don't know how many times I meet such people already, I feel like
strangling them.
But if it's the PSU problem, it's a faulty unit. You are just too
suay. They will give you a brand new one and fix for you. Some will
charge, some will not. Depends on who you bring to.