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Why is my MacBook Pro laptop not turning on at all

I have a Macbook Pro 13" Retina Mid 2014. It has been working perfectly but the othe day it refused to turn on, it was like my battery was completely drained. I charged it for a while (orange light came on charger) but still wouldn't turn on. I put it on a different charger and let it charge over night until the green light came on to indicate battery was full. Still no sign of anything happening when I press the power button. No sound comes out at all, and caps lock light doesn't work (to show me not just display not working). I have tried holding the power button for 10 seconds. I also tried holding pwr

+ shift+cmd+option for ten seconds, when the charger light was orange it briefly turned green when I did this last action and then went back to orange, but nothing else happened as a result.

What fault could possible test this and how would I determine which part to replace. I feel confident with the guides on this site to replace the part, but need some guidance in diagnostics. Any help would be greatly appreciated.

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Did it come in contact with liquid? Did u try a PRAM reset right after u did the SMC reset

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Do you get any lights or sounds when you attempt boot?

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The success of the SMC reset tells us that the top case is working, including the power button and that the machine is getting power. You can try a PRAM reset by pressing the power button and holding Command + Option + P + R and listening for a chime, this is worth a try but truthfully is not likely your answer. If you open the machine up you can try disconnecting the battery and leaving it unplugged while trying to boot off power directly. Past that the most likely scenario is some sort of issue with the main logic board.

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