So im not very computer savvy and this is my first mac. Ive had it for about a year. I think its the g5. Lately its been running very slow, itunes wont sync my nano, and wont work with my itouch. And when I try to download a newer itunes it just says unable to and unknown error. Also cant download any flashplayer, so cant watch many videos, (no videos posted on facebook work). And its just really slow. Any help? thanks