I looked up the board and the RTX and no compatibility issues. I did see that the PSU should be at least 550W respectfully, it is PCIe 3.0 x 16, you should be fine.
Does the fans turn on when you boot up the computer?
My guess would be to Uninstall the drivers for the graphics card.
Turn off your PC.
Take out the graphics card, run off of the motherboard monitor.
After boot up to windows, turn computer off again.
Reinstall graphics card and drivers.
Turn off computer and use the graphic card ports for monitor.
Turn computer back on.
Should be that simple. if this does not work, you could always check if the latest drivers could be having problems and just backdating an older driver.
Let us know any updates.