Only "O" appears in my entire blog, no log-in or anything

Hi! It’s been months since I last posted in my blog but I always log-in. A few days back I even got an e-mail that there was a new comment but only today that I tried to visit my blog.

The problem is that, when I went to my blog it only shows “O” in the upper left corner. Even the login page is showing the same. I have no idea what happened.

Please I badly need help! I don’t have any back-up of my posts. 🙁

My main blog is dahnjacob.com, but my other two blogs under this domain is working properly.

Anyway, I am not sure which version I am using in my blog.