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A page or a full website?
Full Site
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And have Google confirmed that it’s banned?
Nope and just like Yahoo they never will. They just say everything is fine and send you a canned response.
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Have you checked all the obvious stuff like broken links, hidden text, duplicate content (via copyscape)?
Yes, a thousand times. As you can imagine if you had a top 5 site for the term Online Casino and it was there for over two years if it suddenly vanished you would leave no stone un-turned in a quest to get your spots back. I cant tell you how much sleep I lost over this.