Just built my first computer and everything was going smoothly until I powered up my PC and find out that my screen doesn't power on. My PC turns on but my screen doesn't turn green. I connected my screen to my video card since my motherboard doesn't have a slot for my monitor. I have tried moving the video card down another PCI-E but it doesn't work. I use an DVI-A adapter to connect to my computer. Been stuck on this for 2 days, please help!
Verify that both power connectors on the motherboard are firmly connected to the power supply (both the 4 or 8 pin and 24 pin connectors). Also make sure that the PCIe power connectors are firmly connected to the video card.
The fans have a separate power supply mostly, so they'll turn on the moment the PSU turns on.
As Nanekud says, its possible the video card is not working.
Also, I'm not sure if you can replace the mobo, but since your CPU has integrated graphics, you should try to get a mobo with a vga/dvi output. That way you atleast have a backup if your graphics card doesn't work properly.