Question Help! B450M Pro4, Ryzen 3600, Radeon 7950, No Post

Dec 30, 2020
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Hi Everyone -- Trying to build a gaming PC for my kid for Christmas and can't get the build to post. I even pulled out the 3600 again to make sure it was seated correctly. I have tried clearing CMOS by pulling battery, although not sure I did it right. Lights come on, fan spins, but nothing to my screen. It's an old video card but works fine in my other build. BIOS was updated -- had sticker on box and label inside said P4.30. Any other ideas? Bad board?