Chosen Solution

Hey. -Startup is with chime, so I hear the chime. -Tried PRAM and SCM reset. -The screen will not show any image, but it turns into a “lighter” black, and some dead pixels are shown. -It will show a image on a monitor with HDMI, but the loading bar on the startup screens is just halfway and stuck. Tried to change the logic board, but nothing major different… Please help

I would first try an Internet Reinstall of the system. Here’s how to do it: http://osxdaily.com/2014/12/14/reinstall