A couple of weeks ago I went on Craigslist and bought this old MacBook Air 1,1. I took it to the Apple Store because it was running so slow, and they dropped it down from Lion to Snow Leopard. I eventually tweaked everything out so that it doesn't run so slowly anymore. However, according to iStat Menus, my fan is constantly running at 6200rpm, even if I'm not really doing anything. Currently, I have one tab open (Safari) and watching a youtube video in another program (YouView) and my fan is still running at 6200rpm. It occasionally drops to around 4000rpm but that doesn't last long, and is quite rare. After a couple of hours, this thing will become unbelievably hot (I am using it on a flat surface with nothing covering the vents) and to the point where it almost burns if I touch it. Also, a process called Kernal_Task will occasionally start to take up almost 150% of CPU leaving the computer pretty much useless. I figure that's when it gets too hot and I read that Kernal Task will kick in when the computer is starting to overheat. But sometimes that happens when I'm just browsing and I have multiple tabs open. I did tons of research but I don't seem to be having very much luck. Can anyone help out? My specs: 2008 Macbook Air 1,1 13" 60GB HDD 2GB RAM 1.6GHz Intel Core 2 Duo OS X 10.6.8 I have another HP that has some similar specs (2GB RAM and 1.6ghz AMD dual core processor) and I never had any kind of problem like this. On this one, I can't watch youtube normally, I tried ClickToFlash but that was still taking up too much CPU so I switched to YouView which is much better. I can't have more than 3 or 4 tabs open before the computer starts to lag a lot. I can't do very much with this thing. I had an older '08 MacBook (Aluminum Unibody one) and had no such problems, but then again, that one was much faster and I had upgraded it to 8GB RAM. As far as tweaks go, I've got ClickToFlash ClickToPlugin iStat Menus (to keep an eye out on CPU, RAM usage, and temperature) Adblock YouView (to watch Youtube instead of in browser) Here's a screenshot of when I was searching for solutions, and the fan was running at 6200 rpm. I only had 4 tabs open and a youtube video playing in the background. The computer should not be running this hard. Any help would greatly be appreciated. Thanks in advance.