Sylvia Else wrote
Nor really. It does make sense to attempt an estimate even when you don't know what the problem is because some do need estimates and it is possible to do better than nothing based on how long its taken in the past to fix something when it wasn't known what the problem is.
That's unusual with a brownout, to trash a PC power supply.
Not surprising given that it had visible flames.
It'd be pretty unusual for such a small fire as that outside the house to burn down the entire house.
And they will make an obscene gesture in your general direction, I bet.