Thanks of all the help, all the replies helped me out, now I know why I was having trouble with it, I did not understand I was dealing with DC inside the PC.
I have been trying to understand how AC power can change in polarity or cycle and show up on a multimeter as +12 or -12. what determines the polarity at the time you check the voltage? Does this have something to do with the direction or the source? How?
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