I have a Rev. A that I put a 160 gb hard drive in it, I tried the coolbook and it created a kernel error. I uninstalled it and was able to have it reload. The reason I was installing it was because my MBA runs hot, it will go into limp mode about 15 minutes after running a movie or multiple programs. Can any one give me any ideas of what I could do to help with the heat (short of buying a air board to put under it). I take this to class every day and would like to run Vm on it at some point again. Thank you for your time. Colin