Computer Display Isn't Working (Computer DOES work) Self-built

[WhatsAComputerMachine]

My parts:
Intel i7 7700k
32GB RAM (8GB sticks) g skill Trident Z
GeForce GTX 1080 MSI
850 Watt Corsair TX850M PSU

My computer turns on and works perfectly, only the display doesn't work. For many people, their RAM is the problem, but the lights are lighting up. What could be the problem?

 

[Raybigs]

Is everything connected properly into the mobo mono and the psu make sure it is plugged in the correct slots.
Are the display cables plugged into the gpu and the monitor/s properly and the monitor is switched on into the socket
The gpu fans are working right with the pcie slots connected?
It is better to plug cables into the gpu rather than the mobo