Need help with my PC please

Jan 17, 2019
3
0
10
I just built a PC but I am having an issue. Everything is plugged in correctly, the computer flashes LEDs for .5 sec then shuts back off. The CPU and cooler are installed correctly, in using the right screws for the motherboard. I tested all the ram slots. It just doesn't hold a steady boot. Just flashes then shuts back off.