im having this vertical line issue having attempted swapping my optical drive for ssd. Put it all back together and the screen looks like this all over! Not a hint of partial image or anything. Any ideas please folks?

I’m suffering with vertical lines, but no hint of an image. Just put dab in optical drive sata imac 21.5 2009. Vsync cable might be damaged but this looks like a more serious problem than just that? Any ideas folks?