Spock,
Open up ur cpu box ,power on the cpu and see if u can find a green color led light glowing on ur mother board. or may be any color light glowing. if yes then ur getting power to the mother board , ur SMPS is alright. If no then then try borrowing the similar make smps from any sources u know and check if the light on the Motherboard glows or not. let me know wat happ.