Once I [accidentally] had my power supply between a pillow and the couch cushion. My power light went out. I checked the supply, sure enough, it was VERY hot. This comforted me, as when I let it cool down (and unplugged it), it worked again. This tells me there is a heat cutoff built in. A good sign, but not something I rely on. > I've had it happen a couple times on my 15", but every time its > happened, > the adapter has been in very close quarters (IE, not enough room for > it to > properly dissipate heat)