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So what is your setup? How is your circuit powered?
I am assuming you take the regulator circuit from the wiki link and power that by the ATX supply's 12V line?
That probably won't work as the regulator wants >14.5V to get down to the regulated 12V. If you measure the output voltage I think you will observe something like 10V.
You can use another regulator (9-18V or 9-36V input voltages are quite common), but that might be more expensive or provide higher input voltage.
Using the 12V from the ATX might also work. I don't know how nicely regulated the ATX voltage is.