Need some O.T. help

I realize this is way OT, but hope someone can give me some advice. I am trying to install an ATX MB in an ATX case. All jumpers have been set by the book. There is a switch on the power supply, and another on the front of the case. This latter is a momentary contact type. With the MB outside the case on a wooden surface and nothing connected except the power supply plug and the front push button, all that I get is a twitch from the cpu cooling fan, on only the first push, after that nothing until it sets for a while. Since this is the first time I have tangled with an ATX I have no spare parts to substitute, so any help on how this power supply is supposed to operate would be much appreciated. Regards Charlie Fox Charles E. Fox Chas E. Fox Video Productions 793 Argyle Rd. Windsor N8Y 3J8 Ont. Canada email foxvideo(a)wincom.net Homepage http://www.wincom.net/foxvideo