Even if you have a real Dell adapter if that signal on the center wire is gone then it runs at reduced performance. If Not then it runs at reduced performance. The laptop then at boot time checks to see if the adapter is a good Dell adapater or not. The thin pin in the center is what tells the laptop what adapter is being used. The outside of the shell and the inside of the shell provide the DC voltage. The dell PA-12 adpater has three connections to the laptop. ON a Dell laptop in general that means reduced performance and slow to no charging of the battery.ĭells only work properly with Dell batteries and the proper Dell ac Adapter (Charger). If you reported Unknown Device for the AC before, I didn't see it, Sorry. It says "AC Adapter = Unknown device installed." How is looking there again going to fix my problem?
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