You first logged in to Server Fault less than half an hour ago, at 21:30, so I am not sure why you would believe you had any reputation. There don't seem to be any other accounts on Server Fault which also used your IP address, nor any other guest postings.
Most of the remainder of your questions have already been answered in depth on the network meta site:
For your original question:
If the duplicate question does not have an answer that is applicable to your situation.
Repose your question and add the possible duplicate in a link with remarks as to why it does not apply.
If the duplicate question has an answer that also resolves your problem.
Your problem is now solved, congratulations. Is this not why you ...
There are multiple ways you can participate in this community, just like any other SE community.
First off take some time to read the tour and the help center, Server Fault is more than just what the name suggests.
Asking, good, well researched questions should get you some rep as may answering questions.
You can also edit content and gain reputation ...
It used to cost the person who down voted a question 1 fake internet point. It was determined that this was sufficient to stop people from down voting questions that really needed it so for questions, it's now free to down vote.
The only guidance available for down voting is in the tooltip
This question does not show any research effort; it is unclear ...
Why am I being told this halfway through writing my post instead of, say, when clicking the image button?
Didn't I used to have plenty of rep on Server Fault? Where did it go?
I don't know if you have "plenty" of rep on some other account, but you have none on THIS account - it's a brand new account as far as I can ...
Your question is worded in such a way that I think you don't understand the point of downvoting questions.
On the main site downvotes indicate that a question does not meet the community's standards.
This could be for a variety of reasons, including:
The question is unclear: We can't figure out what they're trying to ask.
The question shows no ...
Downvotes happen. Its a fact of life, and the least one can do is try to get used to it. Complaining about it can be counterproductive at times. Its not personal
You might want to reconsider what you're asking. Ask not why you got downvoted. Ask... how you could turn up the awesomeness of your question up to 11.
SF has a professional system administrator ...
Since votes on comments don’t generate any reputation they don’t result in the notification of a change in reputation to the author.
Votes on answers (and questions) by any user allowed to vote will result in a change in reputation and notification thereof that links to the question/answer that was voted on.
Only by referring to @alias in a comment ...
It means the user account, which upvoted your answer, was deleted.
Please see the Meta Stackoverflow FAQ-tag-FAQ question: What does “user was removed” mean and why did my reputation change because of it?
Funny, I was just looking at the main page, saw three bad questions upvoted and couldn't help wonder who the [expletive] was upvoting them.
The "majority" (or at least a good number) of questions get downvoted because the community members who vote feel they are either not useful or lazy, an assement I personally agree with.
Having said that, Server Fault ...
I think it's fine as worded because the definition you were first inclined to apply is a non sequitur and quickly eliminated.
If your user wasn't removed, and that would make no sense as a reason for reputation to be subtracted from an account that hasn't removed, then it's a very simple jump to it being someone else's user.
To expand on Iain's comments, the voting scheme is purely defined by the overall community and isn't directly controlled by Stack Exchange or the moderators. Questions that violate our FAQ (including questions not asked in professional capacity or show little effort in self-research) are prone to be downvoted and eventually closed by votes by the community.
Stack Exchange sites are Question and Answer sites. Anything that isn't a Question or an Answer is, by design, a second-class citizen. "Joining the community" is a matter of participating in the primary purpose of the sites: asking Questions and proposing Answers. Everything else stems from that (as the reputation system tries to hint at).
As for dealing ...
For such suggestion I think it must be asked on MSE, but please validate if it was already asked in the past there. I would not migrate directly as often duplicate get downvoted a lot on MSE
I think the rational of MSE is you can be a good programmer, but a total outsider to be a sysadmin, thus the right gain are by site.
A good exemple; I'am French ...
Yes, this is correct - bounties are non-refundable.
There are many reasons why you might have not get an answer:
no one is interested in it or at least no one knowing a solution
it's also strictly off-topic here (and has now been migrated).
Many of our high-rep users are most likely not interested in bounties at all, let alone something as silly as 50 ...