Hey guys I am currently using my Mac from 2006. It was purchased in December 2006 and runs currently, on OSX Lion. However, the battery is inflated and there are cracks here and there. It sorta shows its age on youtube videos when the sounds goes all fizzy and requires me to either stop the video or insert a headphone jack to make the sound normal. And it tends to overheat quickly and shut down intermediately. Although i mainly use it for facebook, surfing the web, word processing and uni assignment. But other than that it runs atm and has lasted over 7 years. I am wondering whether I should upgrade or not? I only have a year and half of university left and hence should I upgrade?