I'm running AHT on my new 21" iMac because it looks like the additional Kingston memory I have might be bad. (I get random lockups with the additional RAM installed; smooth operation when not installed). I have the extended tests running with looping enabled, and I can cook an egg on the back of this thing. The fans don't run at all during the memory tests. The aluminum is absolutely scorching in some spots. What's the point of a hardware test that cooks the machine's innards? Or should I be investigating a possible fan issue now too? This just doesn't seem right & the machine has been here for less than a week.