Problem: Fan at full speed all the time - even when the Mac is turned off

Hello,
my Mac mini suffers from a very strange problem. I've had it for half a year now and recently bought a new power adaptor since my old one got damaged. I plugged it in and everything was fine - until half an hour afterwards, when the fan suddenly made itself noticeable at full speed. But it didn't stop; it went on, curiously even when I shut the Mac mini down. That's right. even when the system's turned off. The noise is really unbearable and only stops when I plug off the power cord.
Any ideas why this is happening?

My Mini started doing this yesterday. I came home from work and the fan was going full blast. Even after shutting the machine down, the fan would continue to run at full speed (and it is LOUD...much louder than my full tower desktop PC with 4 80mm fans). The only way to stop the fan is to completely unplug the Mini from the power supply.
I doubt that this is due to faulty wiring as my Mini is plugged in to a very nice UPS unit that conditions the power.
Now, I'm willing to admit that this may be entirely my fault since I have upgraded my Mini with 1 GB of RAM, a Pioneer DVD burner, and a higher capacity hard drive. However, the Mini has been running 24-hours-a-day for 5-6 months since my final upgrade, so it would seem that my upgrades are unrelated to this issue. Also, since someone else is having the same problem, again, my upgrades seem unrelated.
I was told on another forum to try resetting the PMU, which I will try when I get home today. If it works, I'll post. Seems unlikely though since the fan runs even when the Mini is powered down.
If anyone has any other ideas, I'd be glad to hear them. I'm assuming that my Mini is no longer under the 1-year warranty since I have performed so many upgrades myself, so, if this problem is something that can only be fixed by Apple, then it will probably cost an arm and a leg.

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Problem: Fan at full speed all the time - even when the Mac is turned off

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