I buy the 3 year warranty on apple laptops and let apple deal with any problems in heat. That said, there are times when I need them to run full bore without the fan on, say when I'm mixing audio, so here is the fix...<p>Before you get the computer cranked up, put on shorts. Place the laptop on your bare legs with plenty of skin contact area. Now as the computer needs to dissipate heat it can send it straight into your legs where your advanced mammalian temperature control system can easily dissipate it. My G4 powerbook never turns on a fan in this configuration even saturating the CPU for long periods.<p>The disturbing part, is that I always expected cyborgs to come about for benefit of humans, instead I'm donating my body to serve the computer.