Upgrade Problem

I bought an AOACE 13700HX with RTX 4060 pre-built gaming desktop PC early this year. I just bought an MSI SHADOW 2X OC RTX 5070 and a Corsair RM1000X (2024) both on sale recently and have installed both. When I press the power button the AOACE logo appears on the screen but then my ASUS monitor says DisplayPort NO SIGNAL. I can hear the Windows 11 startup sound through my speakers. What might be the problem?