Back up your hard drive to an external hard drive or a cd or something. You just never know and better safe than sorry. Especially if you have pictures stored on it. Considering it has a pattern to it's clicking I think it's trying to tell you something...LOL..unfortunately if your like me you don't speek "geek", so call someone or take it in for a check up. My comptuer is a 2004, so I feel like I'm always working on borrowed time!....hope it hangs in there for ya.