Motherboard replacement

A while ago my 350W PSU failed so I replaced it with an Antec truepower trio 550W.

I connected it to my Asus M3A motherboard and when I turned it on, sparks came out of that motherboard.

The motherboard is wasted, and I was told that something with CPU voltages went wrong, I don't really understand, but anyhow, I need to get a new motherboard.

I want it to either be compatible with the 550W PSU and my Athlon 64 X2 dual core 6400+ (because somehow, that's where it went wrong).

OR

If you say it's silly to buy a new motherboard and not a new CPU, which ones should I buy, that are compatible with eachother, my PSU, my memory (I really don't have a clue what type or RAM it is, I could check if you want).

I really need some help with this, I want to avoid another "fireworks party", and need my PC up and running again soon. :(
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  1. I would checkout the asrock 790AOD 790gx ($99.99 plus shipping at newegg). I believe it is one of the boards that will unlock the 4th core of the tri-core phenoms.
  2. i would be terrified of plugging anything new into that psu.

    do psu warrenties cover the hardware they fry? (not saying its your psu, but if it is... im curious.)
  3. There is a very good chance that, originally, either the motherboard failed and took out the PSU or vice versa.

    Having said that, I wouldn't just plug the Antec PSU into another motherboard without doing a little testing first.

    Try to verify (as well as you can) that the PSU works. If you have a multimeter, you can do a rough checkout of a PSU using the "paper clip trick". You plug the bare PSU into the wall. Insert a paper clip into the green wire pin and one of the black wire pins beside it. That's how the case power switch works. It applies a ground to the green wire. Turn on the PSU and the fan should spin up. If it doesn't, the PSU is dead. If you have a multimeter, you can check all the outputs. Yellow wires should be 12 volts, red 5 volts, orange 3.3 volts, blue wire -12 volts, purple wire is the 5 volt standby. The gray wire is really important. It sends a control signal called something like "PowerOK" from the PSU to the motherboard. It should go from 0 volts to about 5 volts within a half second of pressing the case power switch. If you do not have this signal, your computer will not boot. The tolerances should be +/- 5%. If not, the PSU is bad.

    I own an Antec 550 TP3 and it's a pretty good power supply, but I suspect you may have a problem with yours. About the only way you are going to get arcs 'n sparks from a motherboard is if the PSU protection circuits do not electronically shut the PSU down.
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