The CPU fan is detected but system fan is not. Is this the fan in the power supply? My computer keeps restarting and freezing up.
its is likely that the fan is not plugged into the correct port on the motherboard, or that it simply doesn't support reporting. But the freezing sounds like an overheat, you should check that all the fans are working and clean, and replace any faulty ones. The system fan SHOULD be the outtake fan at the back of your case.