Thanks for fast reply Alexoiu!
Is it the same with only CPU and CPU fan installed?...Is there a CPU fan backplate installed that might short the board?
I have only the stock intel heatsink and fan with Pushpins for installation.
If yes, then check again the standoffs...
I double checked each standoff for tightening. I tested the thread compatibility of each kind of screw included with case hardware to make sure I had the right screws for standoffs.
*Should I take mobo out to check standoffs? How to inspect standoffs? I am not sure what else to check.
On the positive side I can always benchtest on cardboard mobo box again to make sure nothing is broken while I have everything uninstalled.
*Will pictures help with this troubleshooting process?