3) anyone else have this problem after opening an iMac? 2) am I correct in my assessment of the two display cables? what are each of their functions? It looks like you can buy a replacement cable for the ‘data’ cable (about $30) but the other (8 wire) cable is a bit more tricky. So my questions are 1) any thoughts on what might have happened and ideas on how to fix. I looked carefully at the pins and cables and they seem fine. I tried opening the system and reseating the cables a few times but the line persists. One that looks like a data cable (with lots of pins) and one that looks like a power cable (with 8 wires). Since I only replaced the HD I only really touched the two cables that go between the display and the main-board. Sorry about the quality, it’s hard to photograph.

That is while the rest of the display shows osx and whatever it's supposed to, the involved pixels always show what's in the images below. The pixels involved do not display what is asked of them. The lines run from the top to the bottom of the display. It looks to be about 20 pixels wide of dark pixels and one center pixel that's lit. Most people talk about a defect in some iMacs (due to a bad capacitor) that cause thin 1-pixel wide vertical lines. The vertical line seems different than what most others report when I google this problem.

On the bad side I have this persistent display issue. On the bright side the rest of the computer and SSD work fine. On this machine, the process went smoothly but when I reassembled the system I now have a vertical line on the display.

I've done this before on another mac without problem. I have a 2013 iMac 21.5' that I recently opened to replace the HD with a SSD.

How to open a imac 27 late 2013