repair motherboard

Laptop model: Acer Nitro 5 AN515 At one point the laptop turned off and does not turn on anymore. When connecting the power supply, it goes into protection mode (until you take it out of the socket and turn it on again). You can also hear a clear spark sound when connecting the power supply...

Hello, all. I'm new to the forum. I am trying to diagnose why my old PC no longer turns on. I'll preface this all with the fact that I'm not an experienced builder, and this is the only PC I've ever built, which was 9 years ago. I've tried reseating all connections, reseating all components...