iMac Overheats like a Car

My iMac developed a problem on Friday: Horizontal lines (perhaps remanents of closed windows) appeared on the screen, soon followed by the iMac freezing. The only solution was to force a restart by holding down the "on" button.

I was puzzled by the problem, but I thought there might be a correlation with the unseasonably (unreasonably) hot weather.

So I used smcFanControl to crank up the cooling fans, and iStat Pro widget to monitor the internal temperature of the iMac. I sped all three fans up to 5,000rpm and watched the internal temperature drop. Problems solved! But lots of fan noise. So I cut the fan speed down to 1,500rpm to quiet things down, and that's done the trick.

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