sounds like a bad board or bad CPU
I've never tried powering on a motherboard without any memory installed, not sure if that would give a sign of life if the memory was the root cause of not starting up. Newegg does list the D.Skill as working with your motherboard although the D-Skill website doesn't have the DQ77MK in their database.
I would try finding a very basic low-density piece of DDR3, put that in, and see if the system comes up.
Check the CPU socket to make sure there aren't any bent pins.
Test the board out of the case on a non-conductive surface to rule out shorting issues.
Check the BIOS configuration jumper to make sure that it is present, and not loose.
>It doesn't loop reboot. It just stays there wihout beep code, without display.
>So I don't know if it actually boot, and just don't display...
I'm having similar problem. It looks like some part of those motherboards are just faulty. This might be timing issue during POST. If I install Intel Celeron G530, everything worked fine. but If I install Core i5-3470 or Core i7-3770K, I see exactly the same issue.
I recommend you to RMA the board if you did not do it yet. In case you already solved your issue, please let me know how.