Please help me fix this laptop. The laptop was working fine but few days ago the charger sparked and the laptop is not turning on. I even ordered a new charger but it still does not turn on. When i press the power button the power light turns on and the laptop turns off. The laptop is also making a weird buzzing noise near the charging port which it was not making when the laptop was working. I have tried replacing the ram removing the hard drive and even removing the bios bettery but its still not working. I suspect the motherboard is dead and needs replacement so please help me fix it.

Dell latitude E7440

https://drive.google.com/file/d/12S4zv53...

Please see the video.

Thanks