I bought a Late 2015 27 inch 5K iMac without an HDD. At this stage, I was able to make an external SSD boot disk and it's working (externally). My plan is to install it inside later. But, as you can see in the pictures, it has some periodic lights on and off at the bottom edge of the screen, all the time. I'm new to Mac by the way. My understanding that this could be due to the LED strip(s)/bulbs or maybe the cable or maybe the board?. There is practically nothing online for videos on this matter and model that shows clearly what's happening.
I'm not even sure if it takes 1 or 2 LED strips?...

Re: New Members - please post your introductions here

Hi, new member here from Canada. I'm looing for a solution for my iMac 27" late 2015 screen with stage lights at the bottom of the screen. I'll search this forum in hope of finding some orientation. Good luck everyone and thank you.