Will the wrong power supply kill a mobo and everything connected to it?
I connected a new power supply incorrectly to the main motherboard connection. Plugged in the 20 pin into the right side of MB 24 pin connector (forced it in!), when I should have plugged it into the the left side, then add the additional 4 pin next to the 20 pin. (the 400watt power supply is compatible with both 24 and 20 pin motherboard connections, of which I did not know at first). After I made this error, I turned on PC---and nothing works, other than yellow AUX light on mobo and fan works on graphics card. So, I re-installed the original PSU of 305 watts, and again---nothing works, no PSU fan, no CPU fan running. So the question is : Did I fry the mobo with everything else connected (RAM, HDD, CPU, etc.)...Or have I only killed the motherboard ITSELF?...I need to know whether to buy a new motherboard (Dell OH7276)...or just buy a new PC altogether.
Dell Optiplex GX280 Tower, 3.4Ghz, 3GB RAM