I had a similar problem. I doubt it it your issue because my Dell laptop was new. All I can tell you is be sure the a/c charger is completely plugged in to your laptop. I had been pushing my charger plug in to my laptop but I was not pushing it completely. My laptop would not charge while I was using it and it did not recognize the charger. If I left it overnight it did charge. Once I realized I needed to push the charger plug in fully everything is working perfectly and no more message about not recognizing the charger. Hope this helps or you are able to find your issue. Paul S. Heimers
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I had a similar problem. I doubt it is your issue because my Dell laptop was new. All I can tell you is be sure the a/c charger is completely plugged in to your laptop. I had been pushing my charger plug in to my laptop but I was not pushing it completely. My laptop would not charge while I was using it and it did not recognize the charger. If I left it overnight it did charge. Once I realized I needed to push the charger plug in fully everything is working perfectly and no more message about not recognizing the charger. Hope this helps or you are able to find your issue. Paul S. Heimers
I had a similar problem. I doubt it it your issue because my Dell laptop was new. All I can tell you is be sure the a/c charger is completely plugged in to your laptop. I had been pushing my charger plug in to my laptop but I was not pushing it completely. My laptop would not charge while I was using it and it did not recognize the charger. If I left it overnight it did charge. Once I realized I needed to push the charger plug in fully everything is working perfectly and no more message about not recognizing the charger. Hope this helps or you are able to find your issue. Paul S. Heimers