Mickey: Unexplained loss of power (Laptop stops using cable, works fine on battery)

I'm going mad.

The story goes like this.

I have a laptop now 4 years old. G750JZ model. Since the first day of purchase I have changed the motherboard, bought new power adapter and new power jack board ( the port where you charge your laptop) and they are all relatively new.

Now the problem is that for the past week my pc at random losses power. By that I mean that instead of using the outlet power because I have it plugged in 99% of the time it stops using that power and uses the battery...

Unexplained loss of power (Laptop stops using cable, works fine on battery)

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