Alienware 17 r2 not staying on with AC adapter only.

May 19, 2018
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I have had an Alienware 17 r2 for over 2 years now. The battery has gotten bad and needs changing.
It is gonna take a while before I get a new battery, so i have taken out the battery to use the laptop on only AC power till I get a new battery.

My problem now is that when I plug the laptop to the wall without the battery and turn it on, it only stays on for a few seconds, up to the point to put in your windows password, then it goes off! What can I do??