This may sound odd and a little too simplistic, but try powering on your system, then flipping the PSU to off and immediately back on again. It works for me when I get no signal. I think it has to do with my mobos poor power regulation, it needs a little kick-start to boot up.
Did you mention what mobo your are using? If it's a K7N420, the above might help you.
Also, try the vid card in another comp, or try another vid card on the mobo. Then you can at least isolate your problem to one component.
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