Hello! My late 2008 15" unibody macbook pro has got some issues since I upgraded to Yosemite. It's a standard 2,4 ghz unibody with 4gb ram and a 120gb ssd. Been running it with the discrete GPU. Since I installed Yosemite I started to get these hangs. The computer hangs for 27 seconds at random times. For example yesterday I was watching a movie and it hung twice, counted to 27 both times - started playing the movie normally afterwards. When programming Java in NetBeans the program reported the computer hung and NetBeans told me the computer was unresponsive for 27 seconds etc. When it happens the spinning ball comes up and spins until the hang ends - sometimes it freezes too. Also had other minor hangs (up to 10 secs) when tabbing in to safari etc. Anyone got a clue - or know where to start looking?