Shoutbox

I got bored, so i decided to flick a little red switch on my desktop pc from 230 to 115 (i believe it must be wattage). and i heard a strange noise, and suddenly my pc has no power going to it (even when i press the on button several times - whoopsie)
So, i go ahead and switch it back to 230, and my pc refuses to have power. Have i lucked out and fried tne power supply, or is the motherboard screwed?
Although you can't see the digits, you can see the red switch on the below image.