FYI; Cable in 27 EMC 2390 I just worked on looked different. Was simple flat connecter with nothing other than blue coloring on end. Just flat gold connectors on bottom side. These kinds are very tricky to extract and even trickier to reinsert as there is too much flex and not enough slack/room for finger/tool to get back in.
My solution is unconventional but works. I do not remove the cables (!). I work on the floor, lying on my belly. I open slowly and carefully only as far as the cables inside will allow. Use a flashlight so you can really see clearly. Then I prop up the both sides of the display using anything the right size (box, a pair of boots…) It is crucial of course that you have things propped up securely so screen can stay a few inches up without hands! I use a very short #10 Torx so I can remove the old HD. There is barely enough room to work but it is do-able with care (and light!). As I am usually putting in an SSD these days, I simply use electrical tape to secure it. Close slowly. Test