u/Infamous-Many-708

I have a pc it was my brother's then he gave it to my sister and im trying to get it working because it hasn't worked since my sister got it. It used to work but games were really laggy then I found out the GPU was the issue it had an error in device manager about the drivers not being compatible with windows or something so I used amd clean utility and that didnt work and the GPU stopped popping up on device manager at all so I took out the GPU and it didnt look like anything was wrong with it so I put it back and now its not displaying anything . If anyone can help me I would be super grateful.