The readings I gave you before have a (k) in front of the ohms sign. for the 12v and an (m) in front of the ohms sign for 5VIN. It switches between K & M automatically.If you are measuring 5 ohms between the 5V pins of the SATA connector and a screw hole, then the PCB is shorted.
In fact if you are measuring 5 ohms at all those other test points, then everything is shorted. I'm sorry, but I don't understand your results. :-?
If you do purchase a replacement PCB, try making the same measurements and compare the results.
5VIN = 5.0 (k)ohms
12VIN = 95.5 (m)ohms