I have an i140 which has been working great. But I just went to open the case for the first time to see about cleaning the inside and possibly upgrading the HD, but I can’t seem to press the release button on the back. It seems to be stuck or blocked by something. I’ve pushed it and tried from different angles about as hard as I think I can without breaking something. Before I start prying on it and potentially breaking something, I wanted to check if maybe I’m doing something wrong, or if there’s another way into the case?