I live close to the exhibition grounds which is near to one of the city's major grid switches. For example, they were testing the new streetcars, the ones with three sections for navigating tight turns and they browned us down to (I assume) 50hz. This was visible as all the lights dimmed and the streetcar appeared to navigate the loop a short time later. As I don't have ups I had powered down my tower. The next time I powered up the breaker in the power supply tripped and when I reset it and booted, my 1.5v agp video card was toasted, at least I hope its the card and not elsewhere on the bus.