Mmmhhh… Ok, take from this what you will. When my incident happened, it was clear to me (since I heard and saw the lighnting strike and smoke start rising from my router) what had happened. My company, however, insisted that this wasn’t possible and said that I hadn’t been using a surge protector as per our IT SOP.
I had been, but lightning strikes coming through telephone wires simply weren’t in their risk assesments etc. In this case, you might want to not mention anything about lightning/thunder when you take your system in. If you do, you might get a “well if you weren’t using a surge protector, you facilitated this problem and your warranty is invalid.”
If your UPS is fine etc, you not saying anything will likely see problems get put down to a manufacturing defect with your motherboard.
Basically, just act dumb and say that your system died out of the blue.