Hey there. I just got an RTX 3090 today. I plugged it in, and wired it up. When I press the power button on my computer, the lights will come on, the GEFORCE logo will light up as well as various RGB in my machine. The fans spin up, and then everything shuts off. This happens over and over until I flip the switch on the PSU. It may be worth noting the light on my motherboard remains amber until the system shuts off. Could I be missing something? I'm using the dongle the card came with, and I wired both 8 pin connectors to it plugged directly into the graphics card. I had a GTX 1080 running on this build previously, so my gut reaction tells me that it's the power supply. But NVIDIA recommends a 850 watt supply, so I should be fine with 1k watts, right?
PC Specs:
Motherboard: ASUS Prime Z390-A
PSU: EVGA 1000w GQ 80+Gold
Intel Core i9 9900k CPU
4 sticks of 8GB Trident Z RGB (128 GB total)
SAMSUNG 970 Evo plus 2TB NVME M.2