My Macbook Pro 15", retina display, early 2013 suddenly doesn't turn on anymore. I can hear the boot up sound, but the display doesn't turn on and the Apple Logo doesn't show up.
I thought that the graphics chip could be broken, but it's not only the display that doesn't work. The Caps Lock LED isn't lighting up as well.
It has about 80% charge and the power cable also works. I tried to use an external monitor but it didn't make a difference. I also tried SMC reset and all those things, without success.
Any ideas what the defect could be?