Turns on for a second the turns back off

Hi! That covers a lot of territory. See if this helps by Tim Fisher. It's a place to start. https://www.lifewire.com/how-to-fix-a-computer-that-turns-on-and-then-off-2624444

 

Agree with Holdum323. Suspect power issue with that big GTX 1080ti. Review and reassess power connections and capability of PSU to deliver sufficient on whatever rail you have it on. Modular cabling means you have to check BOTH ends.

 

So I probably need a bigger PSU?

 

What is your calculated load? Is it on a single rail or divided? Is every modular cable properly connected? Is the power to the big video card sufficient (PCIe slot plus 2 8-pin or whatever is specified by the card maker)?

I cannot tell if you need another PSU. You need to check calculations and connections. If the answers you come up with indicate you need more power, then I would guess that this is what you need.

See https://us.msi.com/power-supply-calculator