I have a strange sound that my unibody has started to make. Every once in a while, maybe every few minutes? My unibody makes this chirping sound. It almost sounds like a bird outside in the trees. In fact for a while I thought is WAS a bird for a while. Its hard to type a sound but its like a high pitched "dinit" just once and then its quiet for a while then...."dinit" Its not effecting performance at all. I did upgrade my stock drive to a 500 GB seagate a few months back but cant imagine how that would effect anything. Any ideas?