It's possible to use a laptop with a broken fan. It's not easy, but it is possible. Unless you want to get real work done, of course.
The fan on my
ThinkPad
failed. It failed once before, but that time
the machine knew it wasn't working and wouldn't start. This
time, the machine seems to think it's fine, but it isn't. Bad
things happen if the machine works too hard. Or they would, except some kernel
module is smart enough to execute a controled shutdown when the temperature
sensor reaches 85°C. (This is definitely a
feature. The alternative probably involves smoke and possibly fire.)
So, what can you do at less than 85°C? Practically speaking, not much. You could read mail except that spam/virus filtering is way too intensive. You could write weblog essays, I guess, but building the actual weblog is way too intensive. Copying images off a digital camera would be ok, except that converting them from raw to JPEG for previewing is too intensive. You get the idea, I'm sure.
I had planned to start thinking about a new laptop this summer, intent on buying one just before the warranty on this one ends. But warranty or not, if it won't run reliably, it's going to get put out to pasture sooner rather than later. To Mac or not, will again be the big question.
In the meantime, the laptop is off to warranty repair again and I'm struggling to (re)re-build a work environment on this desktop box. Productivity may suffer a bit this week.