Question New PC build peripherals not functioning

Dec 28, 2020
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Hey y’all
I’ve just put together my first ever pc build. I’m using the gigabyte b450m ds3h v2 mobo, a 600 watt power supply, t force ddr4 3200 ram, Radeon rx 580 8gb GPU.
yesterday (day of initial build) I was able to post and install windows, get internet access and signed into my windows account. I was able to shut down properly.
Today, when trying to boot, I am able to have the computer and lights and fans going but the monitor, keyboard, and mouse are not receiving any output.
I have tried booting with 1 ram stick, removing and replacing the GPU, have tried removing and replacing the CMOS battery and have checked all connections.
anybody have any other suggestions?
Thanks