psu compatible with mobo?

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plugged in a new psu http://www.newegg.com/Product/...16&Tpk=rp%2b550%2bpcar

smoke came out and a wire is melting, and the mobo seems broken too

mobo = msi socket 754 k8n neo http://www.marketworks.com/hi/57/57246/msi_k8n_neo.jpg

any tips for finding compatable psus for different mobos? really annoyed at the downtime i have now cuz of this.

 

[strafejumper]

think this one is compatable with the msi socket 754 k8n neo? gonna try and find the same mobo and maybe this cheap psu:
http://www.newegg.com/Product/...x?Item=N82E16817152019

 

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think im getting it now lol, i there seem to be two 4 pin connectors from the psu, i must have hooked up the wrong one

 

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psu that was smoking and has 1 melted wire and the mobo that it was hooked up wrong too both seem to still work!
alls well that ends well, windows is on it now, going to go dl all the windows updates