Fan noise after memory Upgrade

Hello,
I have a Mac Mini and I upgraded it to 2GB of memory and now I got a fan noise constanlty going. I have tried to reset the SMC and I left the machine without any cables plugged in for about 45 minutes after my second attempt.
I had upgraded the machine before and this never happened.
Any clue as what I got to do or what may be wrong?
Thank you for any help!
Mac Mini 1.66 GHz Mac OS X (10.4.8)
Mac Mini 1.66 GHz Mac OS X (10.4.8)

To quote from a post by "damfair":
There is a fan speed regulation wire at the front of the Mini that needs to be unattached to get to the RAM slots - if this is left unattached, the fan continually runs at full speed. Could this be the source of the constant fan noise?

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