I am a first time builder and I just built the motherboard and attempted to run setup. The motherboard turns on, all fans spin and I can enter the very first screen which says f2 to setup and what not but before I can do anything the motherboard will automatically shut off. If I turn it on again after than it stays on for an even shorter amount of time. I also reset the CMOS to see if it would have any effect and the motherboard still shuts down. Any help would be greatly appreciated.
CPU: Ryzen 7 1800x
Motherboard: MSI X370 SLI Plus
Ram: Ballistix 32gb 2666MHz
SSD/HDD: Samsung 250 GB 960 Evo WD 1TB HDD
GPU: EVGA GTX 1050 Ti
PSU: EVGA 500B
Chassis: Phanteks P400
CPU: Ryzen 7 1800x
Motherboard: MSI X370 SLI Plus
Ram: Ballistix 32gb 2666MHz
SSD/HDD: Samsung 250 GB 960 Evo WD 1TB HDD
GPU: EVGA GTX 1050 Ti
PSU: EVGA 500B
Chassis: Phanteks P400