Macbook pro will not turn on. No power at all. Adapters working as it charges another mac, but not working on this one. No light comes on either on the adapter.

My macbook pro will not turn on. It is getting what seems to be no power at all. The adapter isn't working on this Mac, however it is working on a second one we have. So we know that it is not the adapter problem. It is completely dead for no reason at all.

Anyone know what could be the problem and how to solve this please?

Thank you