Black screen on boot

Jun 28, 2018
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I got a new set up, after a day I get black screen on boot and the bios don't show up please help.

i7 7700k
Msi z270 carbon itx
CPU cooler: cooler master v8
G skill trident z. 2x 8 GB 2400mhz
Palit gtx 1070 dual
Ssd: Samsung evo 120gb
750 w power
Phanteks enthoo evolve itx

I am 100% shure itx not the gpu because I changed it.
The setup was doing fine, until I played a game and then the PC reboot and turned black screen.

Everything lights up and works but the monitor can't get any source.

Also the server indicator on case (that one with the blinking light) does not blink anymore.

This happened with another case so it must be the mobo, this is the 2nd same mobo because I returned the first one with same problem. So j think it's the mobo.

I've dismantled the pc many times correctly and I can't find the problem. This problem happened this morning and suddenly when I played with the dvi cable it came randomly on. So 1÷ chance that it may turn on. Sorry for bad English I will reply any questions.