I've read a lot about the MBP issue. Some people have said that it's normal for the fan to get loud on the aluminum cased macs when they're working hard. They say it's supposed to do that because of the way the computer was designed to distribute heat. Not to worry.... Then, I've read other people's opinions that this isn't normal and it still shouldn't get that hot. So, I'm lost. No idea which opinion is the right one and I tend to be a bit paranoid to begin with... I have an imac with aluminum casing and when I'm doing something like converting a file on quickbooks, the fan gets loud but otherwise, it works like a dream and is quiet. My MBP however, is another story. The fan tends to get loud a lot even when I'm not running any other programs except Firefox and Mail. Then I realized that this seemed to be happening more when I am on my bed or when it's on my lap. I take my MBP to work and when it's on my desk it's usually pretty quiet if I'm not running anything too intensive. Is the MPB not supposed to be used on a bed? I google'd this and, again, got conflicting opinions. Would it overheat the MPB because of not allowing proper ventilation? Is there anything I can buy and put underneath the MPB so that I would be okay to use it in bed or on my lap and not have to worry about it? And... Is 92 degrees Fahrenheit too hot for the hard drive? When I checked istat, that's what it was at. The CPU was around 173 degrees and all the enclosures were around 100 degrees. This was only running Firefox for just a few minutes on my bed. Should I take my MPB to the Genius Bar or am I just being paranoid? It just seems that the MPB is a lot more heat sensitive than my imac. Advice is appreciated.