Hi!
It sounds like you might be logged into a different account by accident. That could explain why you're only seeing one card. Double-check the email you're using to log in and see if it's the right one.
Also, it's possible you might have closed a board instead of losing it.
To reopen a board, first, click on the Boards button from the Trello homepage or directly from http://www.trello.com/my/boards. From there, click on the View all closed boards button. You may need to scroll to the bottom of the page if you have a lot of boards.
If neither of these helps, could you give a bit more info about what you're seeing? Like, are you missing entire boards or just certain cards? Let me know, and we'll figure it out together!
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