My AMD 6900xt died

I bought a full set of computers last year. A few days ago, my computer screen was blinking and restarting itself. I think it was fine until I finished work and come home but the screen didn't detect the graphic card. I tried to turn it off and on for few times then I worked. but the next day It was the same problem. this time I tried to press the power button off and on many times, but the screen still dark has nothing, and the power light kept blinking. So I switched my old Nvidia 1070 but it works fine no problem. at this point, I don't know what to do. I think the graphics card still has a factory warranty. Thank you

I just did thank you sir.