So I installed CoreTemp with the intent of using it as my main temp monitor/reader for my overclocking needs as it has roven itself worthy to me earlier, but for some reason this time around it shows 0c, here is a screenshot http://postimg.org/image/5oo4lfor7/
If so, try AMD Overdrive, to make sure that the core temperatures don't display 0 there as well, when at load.
There was a thread very similar to this, sometime ago, and I can't remember if the thread-starter's question was solved by finally finding a program that would display the temperatures, or if he ended up having to replace his motherboard. (I do remember that we had told him that, if it was his CPU Core temperatures that were faulty, then it was his CPU, which was not the case. Ugh.)