msi mpg b550 gaming carbon wifi

Hello everyone, I was wandering if rtx 3090 Ti works well with Ryzen 7 5800x ? My rtx 3080 got broken and I'm planning on getting rtx 3090Ti. Should I upgrade the cpu as well? I am can not decide if rtx 3090 will be sufficient or should I go for 3090ti. Will be using it on 49 inch G9 samsung...

So my pc was on and i didn't do anything and all of a sudden my pc turns off. it starts but my monitor says no signal and my keyboard won't light up. also other usb things won't work. i have checked that all the cables are on the right places. motherboard's ez debug light is on vga and the light...