The computer was having trouble running the newer games so I updated the graphics card to a Radeon XFX 7850 and my psu wasn't strong enough. So I purchased a RaidMax RX-730SS ATX psu with 730 watts. I installed the psu first and tested it without the new videocard. Everything worked fine. So I removed my previous drivers and stuck the card in and turned it on. But I made a connection mistake. I put the wrong four connector to the graphics card. I needed to use the pci-e connector. I didn't realize this until after I did something very stupid. I flipped that little red switch in the back of the psu to 220 and turned the computer on. Then off and on. Then off and on a few more times. Really stupid. So I realized this fried the motherboard. Now I'm not sure whether I fried the processor, the graphics card and/or the hard drive. So I'm going to test the GC on a friends computer to check that, and I'm going to check the processor and the hard drive but I'm positive I've ruined the motherboard. It won't even beep. I did all the diagnostic tests I could find on the internet. It's gone. So before I make another stupid purchase. Could you guys help find me a good cheap replacement motherboard? I'm running really low on money now that I've spent so much on the psu and the graphics card. Here's the link to the pc I bought which should let you know what to get but I just don't want to mess up again. Thanks a bunch in advance if you can find me something good! I was also thinking of returning the psu and the GC because I think I got ripped off buying those too!
In general switching the 110/220 switch to 220 on a 110 system will not do any damage(was a good prank in ye old days). Its like trying to use a dead battery, it does not start the car, but does not damage it. feeding 220 in with it set to 110 would be BAD.
I am not sure what you did, may have damaged the power supply, but any power supply worth its money should have shut off and NOT damaged components.
You are almost going to have to test all the parts now to see what does work. With any luck the power supply will be all that is damaged.