Question Computer shuts off after a couple of seconds

Jan 2, 2019
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Yesterday me and my friend played as usual. And then I turned off the PC to go and eat dinner. I turned it of like a always do. When I came back I tried to restart it but it just shut off by itself. When I then tired to turn it on again there was no signal on the screen. Why is this happening? Can´t play and can´t access my PC :( What should I do? I have not touched the inside of the PC for 1-2 months. I built the PC 5 months ago and dn´t now what tot do :(

Specs: Gtx 1080
I5 8600K
Z370 motherboard
240mm liquid cooler
16gb 3000mHZ
2tb harddrive
120 gb SSD
EVGA Supernova 650W