Core Duo overheating

I have had a Core Duo mini for about 5 months. Two weeks ago I installed 2 gb of RAM and everything seemed fine. However, two days ago I noticed the computer was spontaneously rebooting. I checked the CPU temperature and both processors were running at about 71 C when the reboot occurred (I was exporting an MPEG-4 video at the time). The fan does not seem to come on. So, could there be an issue with the SODIMMs or might it be the fan? Something else?
TIA
iMac Core 2 Duo, iBook G4, Mac Mini Core Duo   Mac OS X (10.4.8)  

Well, the fan in the system is generally only running at low speed, so not running at all wouldn't necessarily cause the system to overheat in otherwise identical operating conditions. It likely would run hotter, and perhaps significantly hotter, but may not have hit the auto-shutdown threshold except for heavy or prolonged load. Systems are often surprisingly lightly loaded in 'normal' use.
It may be that an modest air temperature rise, perhaps if you've just started running the heating at home, or a newly installed application has made the difference.
Of course, it could also be an unrelated failure, in which case if the fan isn't functioning at all and all cables are connected, I would try an SMC reset, and if that doesn't resolve it, take the system to an Apple store if there is one within convenient range.

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