Inspiron 530 desktop

So i'm having a bit issues with my inspiron 530 desktop. My computer has been working fine until I decided to switch my current power supply. I got the other power supply from my other pc which I do not use anymore. After plugging cables in my pc turned on by itself and then turned off after a split second. After that it didn't turn on. I switched back to my other power supply which was working fine. My results was that my pc turns on itself when the power cord is plugged into the wall. Now there is no display shown but everything was working fine before. Also, the power button does not work either after. Im not sure if everything is plugged in properly. Can anyone show me the inside of their inspiron 530? Please help!