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Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
What Zanna said is 100% correct and self answers are encouraged but the down votes have nothing to do with self answers, as the questions were voted up.
Let's look at your answers
Dell Inspiron does ...
You can mark it as the accepted answer.
It's not automatic though. There are scenarios where you might have multiple options to accomplish the same thing. You might prefer somebody else's answer (and ...
The rep requirement is for posting a question and its answer together. (That's what the checkbox on that page refers to: an option to compose the answer together with the question before positing both ...