MacBook Pro won't turn on.

My Macbook Pro 15" early 2013 suddenly didn't turn on anymore. I can hear the boot up sound, but the display and the Apple Logo don't work. So I thought that the graphics chip could be broke, but it is not only the display that is not working. Also the capslock isn't lightning, so it seems not to be the graphics chip. It has about 80% charge and the power cabel also works. I also tried to use an external monitor and it still doesn't make a difference. Itried smc reset and all those things, but still without success. Any ideas what could be defect?

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