HELP!! Mac Mini Fan Runs Full Speed

I have a Mini, 2.0 Ghz Core 2 Duo, (part #MB139LL/A), while working in Photoshop CS4 this morning, the fan for no reason shot up to full speed, will not stop or slow down. I opened the case, the fan controller connection is in place, the wires are not damaged. I followed reset SMC instructions, fan blasts back on as soon as power line is inserted. Computer overall seems to be running unusually slow, so slow that I'm in this support forum through a PC.
I have 2 gigs RAM, system profiler says both DIMMS are fine.
I tried downloading most recent SMC update, install says the computer doesn't need it.
Suggestions?

Tried the SMC reset twice to no avail, using the 'hold button in' as described by another poster here. So I tried it again, twice, without holding in the button. No change.
Considering I'm in the middle of a catalog project and do not have the luxury of waiting on repair - replacement of motherboard, I went to Best Buy last eve and bought a new iMac 24". Now I have the task of re-install and xfer of all apps.
Data and projects have always been stored on an external drive and backed up with Time Machine to another external drive, so continuing the project is a simple matter of plugging them in to the iMac. A horrifying experience with a PC taught me that lesson.
The mini will go to the hospital for required surgery, will probably end up on the wife's desk, since she hates the Vista PC I gave her. I hope she likes the Mini, she sure won't get that new iMac anytime soon.
In closing, I am amazed what those tiny Mini's can do. Lotsa horsepower in that tiny box, it was all I could afford at the time. Always have had problems with PC's, never with a Mac till now. This one only had 18 months on it, but it payed for itself countless times over.
Thanks again to all who responded...
Chris

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