I had a recent discussion involving a PC power supply accidentally set to 230V in a first time PC build. The system wouldn't power up when plugged into a regular US 110V outlet. Apparently, it did power up after the the power supply switch was set correctly to 110 V. I'm surprised that the power supply wasn't permanently damaged.

What would the ramifications be to the power supply outputs? I am guessing that since it had a 115V / 230V switch that it wasn't an auto-select PSU. How would the 3.3V, 5V, and 12V outputs be affected? And how would the watts be affected? This is all assuming that the PSU didn't immediately shut down or fry.

I don't know the specifics on the build in question other than it was a 500 watt power supply and that it had a 115V / 230V selector switch.