And don't find out if u have the right settings for ur country by testing it.
The exact same thing happened to my friend. Well originally he had the right settings, but the psu just didn't work. So he turned the swich, pressed the power button. I didn't know what would happen, and neither did he.
Seriously, and it wasn't any small sound, it was like a god damn flashband going off (ofcouse without the über-bright flash)
And no need to tell u the psu was busted, and so was the mobo.
But he got it all fixed with warrenty.