Turns on for a second the turns back off

[Petey224]

Can anyone help me just put this new pc together and it comes on for second then turns back off

I7 7700k
Aorus z370 motherboard
Corsair 16gb ram
Aorus gtx 1080ti
Plextor m2
Corsair rm650i power supply
Thermaltake water 3.0

 

[holdum323]

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

 

[Cycloid Torus]

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.

 

[Petey224]

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?

 

[Cycloid Torus]

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