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Try another PCI-E slot; there could be something wrong with the one you're using if it's causing the same issue with both your 3090 and your old 1080 Ti.
You've previously tried another HDMI and displayport cable, as well as another monitor, so I'd assume you've ruled them out, and it's not the GPU if you're using more than
This leaves the motherboard, PSU, and RAM as what is left.
If switching PCI-E slots works, the problem could be with the entire motherboard's RAM or PSU.
You could test some random DDR4 RAM to rule out the RAM.
You've previously tried another HDMI and displayport cable, as well as another monitor, so I'd assume you've ruled them out, and it's not the GPU if you're using more than
This leaves the motherboard, PSU, and RAM as what is left.
If switching PCI-E slots works, the problem could be with the entire motherboard's RAM or PSU.
You could test some random DDR4 RAM to rule out the RAM.