PC not working ... any advice welcome

Ja, that sort of thing is only done once!

Thank heavens for universal voltage power supplies.
 
If you switched the voltage to 115 at anytime with power running to it, the PSU is fried. Tried that once. Once you replaced that, try switching it on, are there any beeps coming from the motherboard. Usually the mobo beeps when the pc gets switched due to self testing.
 
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