I have the same problem
This is my first post on XDA
I have the same problem like Vaips
I tried to install cyanogenmod but then i wanted to go back to the official rom of samsung, but I realised that i couldn't turn on the wifi and bluetooth. Also I can't use my Sim because the mega doesn't recognize it.
I have installed the official firmware from sammobile a few times but it keeps doing the same thing.
At boot it appears on the screen the same image post by Vaips showing the green line and the other 2 red lines.
I have tried to install cyanogenmod again and the stock rom then, but it keeps doing the same.
Can someone tell me what I can do please?