Mini fan runs even when turned off

Yesterday the fan started running loudly (seemingly top speed) and it won't stop even when the computer is turned off (only way to kill it is to pull the power cord). The vents on the bottom have a bit of fuzz on them, but nothing outrageous. Other than working on the motherboard (which I'm not capable of doing), what can I try? I did reset PRAM...nothing changed.
Thanks!

Is the power/sleep light on or off when the Mini is "off" but the fan is running?
If the light is "on" in some fashion, can you start the Mini by pressing the Menu button of your Apple Remote once?
If you can't do this, I fear you have a logic board problem similar to the one first diagnosed by brisbanebazza:
http://discussions.apple.com/message.jspa?messageID=9524465#9524465
Unless you know someone who can do electronics soldering, generally the fix for this would be to replace the logic board, which is usually too expensive to be economical in my opinion.
BTW, no harm in gently vacuuming the fuzz out of the vents, with the Mini closed up, not open.
After you vacuum, you might also try something wacky: try running the mini upside down for a short period of time.

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Mini fan runs even when turned off

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