Question Fresh pc build won't display

Jan 27, 2019
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this is my build
i5 9400f with stock cpu cooler.
ASRock b365m 4pro Mobo.
8gb 4x4 ballistix ram.
1tb barracuda hdd.
256gb ssd.
RX 570 vega 8gb.
Built this pc this morning put every part together really carefully and in the correct spot every fan powers up gpu, cpu, everything seems to work and sounds keen but won't display i understand maybe not on my 4k tv it won't show up tried on a different older tv still nothing i went through alot of steps tried the ram checked the cpu even though i shouldn't have just second guessing myself please help.
I don't have a vga cable only hdmi.