Well the first thing i would do is taking out all the components and test them on a different build. But if you dont have spare parts then you probably should start with your motherboard.
So take out your pci devices like gpus, unplug hdd and just have the motherboard connected to the psu with 1 ram, cpu with heatsink
Then connect your monitor to the onboard vga port and see if it shows anything.
If not try these methods rub your ram with pencil eraser, or press shut down button 3 times or 1-2min once or reset the cmos jumper pin (see how to do it from ur manual)
And hopefully that'll solve it
I don't have another build to test it on. The motherboard also doesn't offer an onboard video out, because the 8350 doesn't support integrated graphics. I'm definitely gonna try the other methods now. Except for the pencil eraser thing, I don't exactly understand that one?