PSU too small?

Aug 17, 2018
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Boots, no display.

I have a gtx 1080Ti, a core i7-7700K, 4 case fans, a 240mm water supply, 16gb rgb RAM.

My PSU is 550W

I can get the system to boot into windows with no gpu inserted while using on board graphics, but when I insert the gpu and plug it in, it’ll boot with no display. My keyboard will turn off and on, so will my mouse - but my screen will not turn on while plugged into the gpu or the motherboard.

Even if I turn on “integrated graphics” in the BIOS, it’ll still boot with no display - as soon as I take the gpu out, back to normal.

Is my card defective? What is wrong with it? Not enough power?