Confusing Messages re proper Adaptor replacement

Carmelita Cruel

Distinguished
Jun 6, 2011
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18,510
Hello,
I got the message about an undetermined something on my Dell Inspiron 1545. I should also replace my 65Watt Dell adaptor. However, the marks at the back of my PC says "For use with Adaptor PA-21, PA-3E" Which should I buy?