Accidentally Switched Psu 240v To 115v

I am building my own computer and when i tried to put it together, i switched the 240v to 115v. I thought the plug was out the pc but it wasn't. The computer itself was not on so i hope nothing happened with that. Well the psu is busted so a i tried a new one and connected everything back together. Pressed start and nothing happened, all the lights and fans where working but the monitor stayed black. Anyone know what to do? Should i try clearing the rtc ram jumpers? Does anyone have any more tips?

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