Chosen Solution
I have thick green lines appearing vertically on the screen on the login window. After I login I see random flickering blue lines on the screen. I have updated the MacOS to the latest version, reset PRAM and NVRAM but the issue still exists. What might me the reason?
This is a tough one! The bar is telling me the T-CON board has failed, and the sporadic horizontal line could also be a logic board issue with the VRAM. Best to get this system to an Apple Store or authorized service center as it could be costly. Get an estimate first before you let them fix it.
