Question No graphics output and PC turning off and on again

[Sima001]

Our newly built PC doesn't give a graphics output and turns off regularly for about 3 seconds, before turning on again. What could be the problem?

 

[DSzymborski]

The best place to start is a complete list of specs.

 

[Sima001]

Specs:

Chassis: Enermax Libllusion ECA-LL30 Series

CPU: AMD Ryzen 5 3600 XT

GPU: Gigabyte Geforce GTX 1050 Ti

Motherboard: Asrock B450 Pro 4

Power supply: Seasonic 12-550 III (the bronze one)

RAM: Crucial Ballistix Gaming. 16 GB

Memory: Kingston A2000 500 GB