Pc doesnt boot motherboard lets turn on

I just ordered my new msi z270 gaming m7 motherboard.
I tested it from the start and it booted. After putting in the cpu it still booted. Then i build everything else.
After building it all it doesnt boot anymore.
Only the motherboard leds work.
I tried another psu but that gave the same result
I tried another motherboard and that booted instantly.
I just stripped al the parts and my motherboard still doesnt work even with only the 24 pin connector.

My rig:
I7 7700k
Dominator platinum 16gb ram
2 ssd's samsung evo 840
Msi z270 gaming m7

Please help.
Sorry for bad english
Reply to semverhoef
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