Hey all, I recently received my refurbed Blackbook. I haven't experienced any major problems, but I have noticed that when I'm watching youtube videos or any flash videos in general, the left side of the Macbook starts to get hot and the fans kick in loudly. I've also experienced this a couple other times when the Mac was taking some time transferring multiple files to a USB drive. So I was just wondering if this is a normal aspect of the Macbook, or something I should get checked out? Thanks in advance!