Hey guys my imac seems to be lagging when I play videos of movies or soap operas that I downloaded online. What do you think the cause of this could be? I play the videos in VLC, and I should be having a lag free smooth video play back right? I think im still within the 14 day period, should I call apple and request a replacement? Does anyone know a fix for the problem? Also my HDD is always running at a constant 59 ~ 60 c when just watching videos / movies is this within normal temperatures?