Thank you for your reply. My replacement screen is arriving today and after your message and online tutorials, I am confident I can replace it.
Since then, as expected the black blobby crack is spreading. However, there is now a constant flickering. It started on the bottom quarter of the screen, kind of a greenish color, and is now the entire screen. Is this a problem that will be solved (or at least could be solved) by replacing the screen or is this something else?
It may have a tenuous hold on the ribbon cable connection to the rest of the hardware but the crack is good enough reason to replace it.
Thank you SO much for your help and advice. I replaced the screen on my own and I am quite proud of myself.
The magnet advice was A+, as those screws are tiny.
It took me about 2 hours...as I was being very careful. But the first time I tried, it didn't work properly, as I could only see a faint screen. I got frustrated and thought it was the wrong type of screen, but I took a breather, and did it all again.
It worked, perfectly!
I assume that cable wasn't snug enough, but regardless, the joy I felt was real.