Dell latitude power button blinking laptop not turning on
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
Please see the video.
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