Greetings,
New build, could be almost anything. Without knowing more about your system:
Test with wired mouse/keyboard
Try with one stick of RAM, also test all RAM
Test with different video card or onboard with vid card out
Verify health of your PSU
Reseat mem, CPU and video
Check CPU and memory sockets for damaged/bent pins
Make changes one at a time between boots/testing. Enter BIOS, let sit, test for freezing, power off and move on to next test.
This is going to be something related to hardware or compatibility. Others may have additional feedback.