Question Upgrading Intel MB graphics to dedicated card

Aug 18, 2018
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I built my first computer 7 months ago at 70 yrs old. Asus Hero XI, I7-8700k over clocked to 4800, 32mb Trident Z 3200, 1gb Samsung 970 Evo M.2, dual monitors, win10 pro. Everything running great with no problems.

10 days ago I decided to upgrade from on board Intel 630 graphics to a dedicate card and bought an Asus ROG Strix 1660ti OC. I figured install the card, switch the monitor cables and I'm good to go. Right? Wrong!

I switched everything back to original, works fine. Hook up the new card, nothing.

What am I missing? Software?