Backstory - can skip - I have a down draft cooler on my i5 4460 and b85. 1/3 of the cpu fan broke off but was still spinning most of the time, however, the uneven spin wobbles the whole motherboard. Sometime the fan would not spin, i figured it was ok for the time being. if its gets too hot, it should shut itself down.
This went on for a few days. Then the mobo would boot up, but no display signal, internal +external. I have another pc to test everything, except the cpu, mobo and ram.
how to determine if cpu or mobo is broken???