Here is the situation. I installed a new Gigabyte P55 MB with an i5-750. It initially worked fine from the first boot. I noticed it was running a little hot so I installed a new case fan (not a new CPU fan). It did not boot up after that..even after I put old fan in..I also put my old AMD MB back in and that booted fine so it's not the PSU.
I am wondering-how quickly does a processor heat up? It feels HOT to the touch after just turning off and one for a brief period . Not sure if oveheating is the issue-I do not even get to the bios screen..