Question Pc turns on for a second then shuts off

Sep 22, 2019
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I just built a new pc the specs are given below. Whenever I plug it in and turn on the power supply, all the LEDs light up for half a second but then shut off. I have checked all the internal connections. Also the pc isn't connected to a display yet, does that effect this?
i7- 9700k
Evga rtx 2070 black xc
Cooler master masterwatt 750w
Cooler master ml120 rgb
Corsair crystal 570x
 

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