I doubt that you actually have a hardware problem if you were able to type all of that and have a functioning computer. If the 12V rail were at 2V, you would not be able to boot your computer
Sometimes in manufacturing, the probes that measure things like voltage or temperature do not report properly. I have a HDD that reports that it is running at something ridiculous like 60 C.
If you are still worried about it, take a voltmeter and measure the voltage between the black pin and the yellow pin on one of your unused molex
connectors. This will give you a true reading of what your 12V is at.