My new motherboard ( no boot GPU fan doesn't spin power supply fan doesn't spin)

msalbarbary

Prominent
Dec 13, 2017
3
0
510
Hello,
I have this PC:
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Motherboard Asrock z270 killer sli
Ram CORSAIR Vengeance LPX 8GB (2x4GB)
GPU ASUS GeForce GTX 1080 8GB ROG STRIX
Power supply Corsair RMx Series, RM750x, 750W
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No display, power supply fan doesn't spin, GPU fan doesn't spin. All motherboard light and GPU fans are working.
Please help me...