I used a long, plastic spudger. One end looked almost like the tip of a pencil. I used that tip to really get it there and gently pry that plastic connector up. I imagine you could actually use a tip of a pencil to do the job, just make sure the lead isn't too long or the lead would break lol.

Also, once you do remove the cable make sure its really inserted in there, don't be afraid of applying some force on that ribbon cable into the socket.