Paul, thanks again.
Yes, I see metal through the cable. The two wires on the left are exposed. One of them seems to be damaged, while the other just exposed. I can't seem to make it work at all now: while before I could at least evetually boot, now I only get the "No Hard Disk Found - Contact Support" message.

Do you have an recommendation on how to prevent this? I had just replaced the original cable with one from Eutronix. Fortunately, I had bought three, a year ago. Clearly, while the original was not scratching against the display board, these ones are, so I guess I will have to find a solution as soon as I replace the cable with one of the remaining two...